Emerson 37E73A 906 Thermostat User Manual

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3
7E73A-903 & 906 INTELLI-VENT™  
Water Heater Thermostat Control  
Installation Instructions  
For Natural Gas Only  
Operator: Save these instructions for future use!  
FAILURETO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE  
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL  
INJURY AND/OR PROPERTY DAMAGE.  
DESCRIPTION  
The 37E73A-903/906 INTELLI-IGNITION™ control is a  
combination gas valve, ignition control, and thermostat for  
use on Power Vented water heaters. The microcomputer in  
the control supervises the ignition sequence and timings  
for the water heater, and provides diagnostic codes in case  
of system malfunction. The control provides direct burner  
ignition using the White-Rodgers’ Silicon Nitride ignitor. The  
control uses the INTELLI-IGNITION™technology to greatly  
extend the ignitor’s life.  
Fixed Adjustment Regulator Controls: The gas regulator  
on this control requires no field service. The regulator  
automatically controls and maintains the burner gas pressure.  
PRECAUTIONS  
WARNING  
!
WHAT TO DO IFYOU SMELL GAS”  
WARNING  
!
Do not try to light any appliance.  
Do not touch any electrical switch; do not use any  
phone in your building.  
Immediately call your gas supplier from a neighbor’s  
phone. Follow the gas supplier’s Instructions.  
If you cannot reach your gas supplier, call the fire  
department.  
FIRE, SHOCK AND EXPLOSION HAZARDS  
Shut off main gas to appliance for service or until  
installation is complete.  
Disconnect electric power before servicing.  
Do not exceed the specified voltage.  
Replace existing control with recommended  
model.  
Protect the control from direct contact with water  
WARNING  
Do not use this Natural Gas control on LP Gas water  
heater. Improper operation could occur, resulting in  
personal injury and/or death due to Carbon Monoxide  
CO) poisoning, fire, or explosion. Check for proper  
gas type as listed on the rating plate affixed to the  
water heater.  
!
(
dripping, spraying, rain, etc.)  
If the control has been in direct contact with water,  
replace the control.  
Label all wires before disconnection when servic-  
ingcontrols.Wiringerrorscancauseimproperand  
dangerous operation.  
Route and secure wiring away from flame.  
Ensure proper earth grounding of appliance.  
(
CONTENTS  
Ensure proper connection of line neutral and line  
Description ............................................................. 1  
Precautions ............................................................ 1  
Specifications......................................................... 2  
Installation.............................................................. 2  
Wiring..................................................................... 5  
Operation................................................................ 6  
Troubleshooting...................................................... 7  
hot wires.  
Do not use tools to operate this control.  
Do not take control apart, there are no serviceable  
parts inside.  
Do not use control if it has been flooded.  
Never stand on the control or use as a step.  
PART NO. 37-7109A  
www.white-rodgers.com  
www.emersonclimate.com  
0951  
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SPECIFICATION  
ELECTRICAL RATINGS:  
Automatic High Temperature Cutoff:  
o o  
Single-Use Type, 185 F(82 C)  
Input and Frequency: 120 VAC, 60 Hz  
Output Ratings:  
Prepurge Time: 5 Seconds  
Ignitor Load: 2 Amps maximum  
Inducer Draft Motor: 3 Amps Full Load, 4 Amps Locked  
Rotor  
Ignitor Warm-up Time: 20 Seconds  
Trial for Ignition Period: 4 Seconds  
Inter-purge Time: 5 Seconds  
Current: 0.2 Amps @ 120 VAC  
Range of Regulation (Btu/Hr)  
Post-purge Time: 5 Seconds  
Minimum: 30,000  
.0” Pressure Drop Capacitya  
00,000 Btu/Hr  
Maximum: 150,000  
Ignition Retries: 2 Retries; 3 Trials before lockout  
Ignition Recycles: 2 Recycles, 3 Losses of flame before  
lockout  
1
1
a
3
Based on 1000 Btu/ft , 0.64 specify gravity natural gas  
BODY CONFIGURATION:  
Maximum Inlet Pressure: 1/2 PSI maximum  
Right angle with a 1/2” NPT inlet and a 1/2” inverted flare  
outlet  
Ambient Temperature Rating:  
o
o
o
o
3
2 F to 160 F (0 C to 70 C )  
MOUNTING:  
Limited Horizontal/Vertical  
INSTALLATION  
To protect the control from dirt and contamination, a drip leg  
or sediment trap (see Figure 1) must be installed in the piping  
leading to the control.  
NOTE  
1
2
. This control must be installed or serviced only by a  
professional.  
1
. Apply pipe compound to the male threads of the pipe that goes  
into the control, leaving the first two or three threads clean.  
. For your safety, this control is supplied with tamper  
resistant screws. Do not attempt to repair or adjust  
the control. If you experience problems, replace the  
control immediately. Continuing to use a damaged  
control could result in fire and/or explosion.  
. An odorant has been added to the gas to help you  
detect it. Before lighting, search for the odor of gas by  
sniffing at floor level around the water heater.  
. In some situations, the gas may lose its odor.To detect  
unodorized gas, you must have a gas detector, which  
can be purchased from your gas company. If you do  
not have a detector and have the slightest suspicion  
that gas may be present, get out of the house and call  
the gas company. DO NOT RELY TOTALLY ONYOUR  
NOSE.  
2
. Install control in the tank. Turn clockwise (  
). Use a  
short piece of pipe to help in turning. Align the control so  
that the burner tube may be connected.  
3
4
. Make the main burner connection. Do not use pipe joint  
compound or Teflon tape.  
3
4
. Connect the gas line. Use new black iron pipe that has  
been properly reamed. If old pipe is used, be sure it  
is clean and free from rust and scale. Use pipe joint  
compound on male threads only. (Use pipe joint compound  
approved for natural and LP gas service.) Do not use  
TEFLON tape. Do not apply compound to the first two  
threads.  
5
6
. DO NOT use joint compound or tape on the union  
connection.  
. Make the electrical connections to the control. There  
are two plastic connectors that plug into the bottom of  
the control. The connectors are “keyed” so that they can  
only be inserted one way. Make sure that the connectors  
are properly aligned before attempting to insert. DO  
NOT FORCE THE CONNECTORS; DAMAGE TO THE  
CONTROL WILL RESULT.  
REMOVING THE OLD CONTROL  
. Shut off the gas to the water heater  
. Turn off electrical power to the water heater.  
. Remove the two plastic wire connectors that plug  
into the bottom of the control. The connectors have  
latches which must be depressed. DO NOT FORCE  
THE CONNECTORS, DAMAGE TO THE WIRING MAY  
RESULT.  
1
2
3
7
. To fill the water heater with water:  
a. Close the water heater drain valve by turning the  
handle to the right (clockwise). The drain valve is on  
the lower front of the water heater.  
4
5
. Shut off the water at the cold water inlet.  
. Connect a hose to the water heater drain cock. Drain the  
water to a nearby drain. Open a hot water faucet for faster  
draining.  
b. Open the cold water supply valve to the water heater.  
6
7
. Disconnect the gas line at the union (Figure 1). Remove  
the piping from the old control.  
NOTE  
The cold water supply valve must be left open when the  
water heater is in use.  
. Remove the control by turning it counterclockwise (  
).  
INSTALLING THE NEW CONTROL  
c. To ensure complete filling of the tank, let air exit by  
opening the nearest hot water faucet. Allow water to  
run until a constant flow is obtained. This will let air out  
of the water heater and the piping.  
All piping must comply with local and state ordinances or  
with the National Fuel Gas Code (ANSI Z223.1-NFPA 54),  
whichever applies.  
Dirt or contamination in the gas line can block the control  
from operating creating a risk of explosion, injury, or death.  
d. Check all new water piping for leaks. Repair as needed.  
2
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INSTALLATION  
5
6
. For a brief (one to five seconds) all of the indicators on  
the front of the control should come on, and then turn  
off. This indicates that the control has completed the  
self-diagnostic test, and is ready for operation. If any  
combination of indicators remain illuminated, either refer  
to the troubleshooting section of this manual, or contact a  
qualified service person.  
. The water heater is now ready for operation, and will  
begin to heat the water to the factory default setting of  
approximately 70 F. If an alternate temperature setting is  
CAUTION  
!
Never use this water heater unless it is completely  
filled with water. To prevent damage to the tank, the  
tank must be filled with water. Water must flow from  
the hot water faucet before turning ON gas to the  
water heater.  
GAS SUPPLY  
PIPE  
SHUT-OFF VALVE  
o
required, please refer to the following section “Temperature  
Regulation.”  
GROUND JOINT UNION  
TEMPERATURE REGULATION  
After the gas and electrical connections are made and the  
water heater tank is full of water, the control will now start to  
heat the water to the factory default setting of approximately  
INTELLI-VENT™  
TEE  
CONTROL  
7
0°F. If a higher setting is desired, start with the setting at the  
DRIP LEG  
SEDIMET TRAP)  
triangle( ). This is approximately the 120°F setting, and the  
safest and most economical setting for the water heater.  
(
3" MINIMUM  
To change the temperature setting for either cooler or warmer  
water, the following steps are necessary:  
(
MANDATORY)  
PIPE CAP  
1
2
. “Wake up” the temperature indicators by pressing the  
COOLER and HOTTER temperature adjustment buttons at  
the same time and releasing after one second (see Figure  
Figure 1. Typical gas connection  
8
9
. Open the gas shutoff valve.  
. BEFORE TURNING ON THE APPLIANCE, CHECK THE  
GAS LINES FOR LEAKS.  
a. Use a soapy water solution. DO NOT test for gas leaks  
using a match or open flame.  
b. Brush the soapy water solution on all gas pipes, joints,  
and fittings. Use care that excess solution does not  
enter the control’s plastic housing.  
c. Check for bubbling soap. This means you have a leak.  
Turn OFF the gas and make the necessary repairs.  
2
). One or two of the temperature indicators will light up.  
These indicators will only remain on for 30 seconds if no  
further buttons are pressed. After 30 seconds the control  
will go back to “Sleep” mode, and both buttons will again  
have to be pressed to see the water temperature setting.  
. If this is the first time that the control has been used, the  
leftmost green indicator will be illuminated indicating the  
water temperature setting of approximately 70°F. See Table  
1 for an explanation of what each of the temperature indi-  
cators mean.  
d. Turn on the gas and recheck for leaks. Repeat this  
process until you are sure the system is gas-tight. If  
repeated work on a part does not stop the leak, the  
part must be replaced.  
TEMPERATURE  
INDICATORS  
e. Rinse off the soapy solution and wipe all the plumbing  
parts dry.  
TEMPERATURE  
ADJUSTMENT  
BUTTONS  
OPERATING INSTRUCTIONS  
. The control uses an automatic ignition system to light  
the burner. DO NOT TRY TO MANUALLY LIGHT THE  
BURNER.  
1
2
. Wait at least five (5) minutes to clear out any gas, and then  
smell around the appliance area near the floor. If you smell  
gas, STOP! Follow the instructions “What to do if you  
smell gas” on the first page of this instructions sheet. If  
you do not detect gas, continue with the next step.  
. Make sure that both the inner and outer doors are in place.  
These doors are located where the burner tube enters the  
water heater at the bottom. Both doors must be in place for  
safe operation.  
. Turn on power to the water heater. This can done either  
by turning on the disconnect switch to the water heater,  
or plugging in the water heater to a nearby outlet. The  
installer should have made this provision for you, and  
it must meet local and state ordinances of the National  
Electric Code, whichever applies.  
Figure 2. Temperature Indicators and Adjustment  
a. To decrease the temperature press and release the  
COOLER button once. The temperature indicators will  
now display the new temperature setting. Press and  
release the COOLER button until you have reached the  
desired setting. HOLDING DOWN THE BUTTON WILL  
NOT CONTINUE TO LOWER THE SETTING. The But-  
ton must be pressed and released for each tempera-  
ture change desired.  
3
4
b. To increase the temperature press and release the  
HOTTER button once. The temperature indicators will  
now display the new temperature setting.  
3
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INSTALLATION  
Press and release the HOTTER button until you have  
reached the desired setting. HOLDING DOWN THE BUTTON  
WILL NOT CONTINUE TO RAISE THE SETTING. The button  
must be pressed and released for each temperature change  
desired.  
WARNING  
!
Never allow small children to use a hot water tap, or  
to draw their own bath water. Never leave a child or  
impaired person unattended in a bathtub or shower.  
Scald burns can result  
To avoid scald injury, set the control to the lowest setting  
which will deliver your needed hot water. Refer to Table 1 to  
determine the approximate temperature setting, and the ap-  
proximate time for scald injury at that temperature.  
Checking the temperature setpoint may be performed at any  
time by the procedure described on step 1 of “Temperature  
Regulation” on page 3. No other action is needed for checking  
temperature setpoint.  
Table 1.Temperature Settings  
Display  
Approximate  
Temperature  
Approximate  
Time to Cause  
Injury  
SHUTTING OFF THE APPLIANCE  
o
A
B
C
(+10 F)  
Vacation Shutdown  
7
0 (Vacation)  
N/A  
1
. “Wake up” the temperature indicators by holding down  
both the COOLER and HOTTER temperature adjustment  
buttons at the same time for one second (see Figure  
110  
115  
120  
125  
130  
135  
140  
145  
150  
2
). One or two of the temperature indicators will light up.  
5 minutes  
30 seconds  
5 seconds  
Make a note as to which indicators are illuminated so that  
you can reset the control to the same setting when you  
return from vacation.  
2
3
. Press and release the COOLER button as many times as  
needed until the green leftmost indicator is only lit. This  
temperature setting is approximately 70°F. Leave the gas  
turned on.  
. When returning from vacation reset the temperature to  
that you noted in step 1.  
1.5 seconds  
1
60  
under 1 second  
Complete Shutdown  
Flashing  
1
. Turn off the electrical disconnect on the appliance, or  
remove the plug from the receptacle, whichever applies.  
(
Don’t worry; the Intelli-Vent™control will remember your  
WARNING  
!
correct temperature setting.)  
Scald burns occur in under one second with 160°F  
water, which this thermostat will deliver if the  
temperature is set at “VERY HOT”. Lower settings of  
the temperature will reduce the risk of scald and will  
reduce your fuel bill.  
2
3
. Turn off the gas supply to the water heater. The water  
heater is now completely shut down.  
. To restart the water heater, follow the instructions in the  
section “Operating Instructions”.  
There are no user serviceable parts in this control. The con-  
trol is supplied with tamper resistant screws. DO NOT attempt  
to repair or adjust the control. If you experience problems,  
discontinue use and replace the control immediately. Con-  
tinuing to use a damaged control could result in fire and/  
or explosion.  
3
. When you have completed setting the control wait 30  
seconds to see that the temperature indicators go off and  
the control enters “Sleep” mode. ALL OF THE TEMPERA-  
TURE INDICATORS WILL BE OFF DURING NORMAL  
OPERATION. If any time you see the indicators on, there  
may be a system error and you should consult the “Trou-  
bleshooting” section of this document, or contact a trained  
service professional.  
Service  
If you wish to verify that the water heater is operating properly:  
1
2
3
. Make sure there is power to the water heater.  
. Make sure that the gas is turned on to the water heater.  
. Initiate a call for heat by either drawing hot water from a  
nearby faucet or raising the temperature setting (see sec-  
tion “Temperature Regulation”).  
If you use hot water frequently and in short spurts, water tem-  
perature can occasionally exceed the temperature setting by  
up to 30°F because of the dynamics of the appliance. Keep  
this in mind when you are selecting a temperature higher than  
the factory default setting.  
4
5
. Watch the ignition sequence and compare it to the “Se-  
quence of Operation” chart on page 6.  
. Note any error codes that appear and proceed to the next  
section “Troubleshooting”.  
Be sure to protect babies and the infirm or others with im-  
paired mobility who cannot get out of the hot water quickly.  
They are the people most commonly hurt in scald injuries and  
in need of lower temperature and other protection like super-  
vision, point-of-use temperature control equipment or a sys-  
tem mixing valve. A point-of-use valve or system mixing valve  
can be obtained from your local plumber.  
4
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WIRING DIAGRAM  
A typical system wiring diagram is shown below. Use the  
water heater manufacturer’s wiring diagram for details of the  
installation. Always follow the instructions supplied with the  
water heater, and those of the water heater manufacturer.  
Intelli-Vent Wiring Diagram  
Typical Installation  
(
Consult Appliance Manufacturer's Instructions For Details)  
TM  
INTELLI-VENT CONTROL  
BOTTOM VIEW  
INSET  
FLAMMABLE  
VAPOR  
SENSOR  
(
IF EQUIPPED)  
IGNITOR AND  
FLAME PROBE  
ASSEMBLY  
BLACK  
WHITE  
GREEN  
TO POWER SUPPLY  
DISCONNECT  
AND OVERLOAD  
PROTECTION  
HIGH  
LIMIT  
SWITCH  
AIR  
PRESSURE  
SWITCH  
COMBUSTION  
BLOWER  
5
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SEQUENCE OF OPERATIONS  
APPLY POWER TO  
APPLIANCE  
Intelli-Vent™  
Sequence of Operation  
NO  
IS FIELD WIRING  
CORRECT?  
DISPLAY ERROR CODE  
OR  
1
2
YES  
REQUEST  
FOR HEAT  
PRESENT?  
NO  
YES  
IS  
WAIT FOR PRESSURE  
SWITCH TO OPEN  
DISPLAY ERROR  
IS  
NO  
WAIT FOR PRESSURE  
SWITCH TO OPEN  
DISPLAY ERROR  
NO  
PRESSURE SWITCH  
PROVEN OPEN WITHIN  
PRESSURE SWITCH  
PROVEN OPEN WITHIN  
5
SECONDS?  
NUMBER  
3
5
SECONDS?  
NUMBER 3  
YES  
YES  
COMBUSTION  
BLOWER ON  
COMBUSTION  
BLOWER ON  
ONE HOUR AUTO  
LOCKOUT RESET  
DELAY  
IS  
IS  
WAIT FOR PRESSURE  
SWITCH TO CLOSE  
DISPLAY ERROR  
WAIT FOR PRESSURE  
SWITCH TO CLOSE  
DISPLAY ERROR  
PRESSURE SWITCH  
PROVEN CLOSED  
NO  
PRESSURE SWITCH  
PROVEN CLOSED  
NO  
WITHIN  
SECONDS?  
5
WITHIN 5  
SECONDS?  
NUMBER  
4
NUMBER 4  
YES  
YES  
PREPURGE  
IS  
NO  
TURN OFF INDUCER  
DISPLAY ERROR CODE  
IGNITOR  
OKAY?  
NUMBER  
5
TURN OFF INDUCER  
AFTER POST-PURGE  
YES  
COMBUSTION  
BLOWER OFF  
DISPLAY ERROR  
6
IGNITOR ON FOR  
WARM-UP TIME  
MAIN VALVE OPENS  
INTERPURGE  
MAIN  
BURNER LIGHTS  
AND IS SENSED  
DURING TRIAL  
FOR  
NO  
LESS  
THAN TRIES  
3
YES  
MAIN VALVE CLOSES  
FOR IGNITION?  
IGNITION  
YES  
NO  
IGNITOR TURNS OFF  
IS  
FLAME SENSE  
LOST?  
YES  
LOST  
YES  
MAIN VALVE CLOSES  
LESS THAN  
TIMES?  
3
NO  
NO  
NO  
IS  
REQUEST FOR HEAT  
SATISFIED?  
YES  
Please Note:  
MAIN VALVE OFF  
The control continually monitors  
internal circuits and external sensors.  
Error codes noted above, and those for  
self-diagnostic faults can be found on  
pages 8 and 9.  
COMBUSTION  
BLOWER OFF AFTER  
POST-PURGE DELAY  
6
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TROUBLESHOOTING  
The troubleshooting charts cover the error codes that the  
Intelli-Vent control can recognize, the potential cause, and  
perature setting (see section “Temperature Regulation”).  
If you have noted an error code from a previous heating  
cycle, this step is not necessary, and you may proceed  
with the next step.  
TM  
those actions that may help repair the problem. The water  
heater manufacturer’s troubleshooting procedure should be  
consulted before attempting to repair the appliance. The wa-  
ter heater manufacturer’s instructions take priority over the  
instructions here.  
2
3
4
. Refer to the troubleshooting charts on below to find the  
error code that is displayed. Check and repair those items  
recommended.  
If for any reason you question your ability, or feel any doubt  
about your ability to perform any of the troubleshooting pro-  
cedures or repairs recommended. STOP! Contact a trained  
and qualified service professional to repair the water  
heater.  
. Once the repair is complete, again initiate a call for heat,  
and observe that the ignition sequence complies with that  
shown on page 6.  
. After the water heater repair is complete, return the water  
heater temperature setting to the original temperature. If  
for any reason you cannot remember the original setting,  
To troubleshoot the system using the error code indicators:  
o
1
. Check that the system is currently active and calling for a  
request for heat.You can initiate a call for heat by either  
drawing hot water from a nearby faucet or raising the tem-  
return the setting to the 120 F setpoint. See the section  
“Temperature Regulation” for assistance in setting the wa-  
ter temperature setting.  
Error  
Indication  
Check, Repair, or Replace  
An open earth ground cir-  
cuit to the ignition system  
1. Check that the earth ground conductor is properly  
connected at the fuse box or breaker panel and the  
water heater.  
A
B
C
1
2
. Check that the grounding conductors on the water  
heater are properly connected and secure.  
The self diagnostic test  
detected a wiring error or  
a high resistance to earth  
ground  
1. Check for proper connection of the line neutral and  
line hot wires.  
2. Check that the appliance is securely connected to  
earth ground.  
A
A
B
B
C
C
2
3
4
The pressure switch re-  
mained closed longer than  
1. The pressure switch wiring is incorrect.  
2
. The pressure switch is defective and must be  
replaced.  
5
seconds after the call for  
heat began.  
The pressure switch re-  
mained open longer than 5  
seconds after the combus-  
tion blower was energized  
1. The pressure switch wiring is incorrect.  
A
A
B
B
C
C
2
. The pressure switch tubing is not connected cor-  
rectly.  
3
. Obstructions or restrictions in the water heater air  
intake or exhaust flue.  
The self diagnostic test has 1. Check that all wiring is correct and secure.  
detected an error in the Hot  
Surface Ignitor circuit.  
5
2
. Disconnect the ignitor and measure the ignitor re-  
sistance with an accurate ohmmeter between pins  
1
1
and 2. Resistance should be between 11.5 and  
8.8 ohms. If the reading is incorrect, replace the  
Hot Surface Ignitor.  
3
. If the above checks are good, replace the INTELLI-  
VENT control.  
1
2
3
4
TM  
The maximum number of  
ignition retries or recycle  
has been reached and the  
system is in lockout  
1. Check if the gas supply is off or too low to operate.  
A
B
C
6
2
. Check that the flame sense rod to see that it is  
located properly and free from contamination.  
Reposition the flame sense rod or lightly clean with  
an abrasive cloth.  
3
4
. The Hot Surface Ignitor may not be positioned cor-  
rectly. Reposition as necessary.  
. The Hot Surface Ignitor and Flame Sense Rod  
wired correctly and in good working condition.  
Repair as required.  
5
. Low voltage to the water heater. Check and repair.  
7
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TROUBLESHOOTING  
The self diagnostic test  
found a problem with the  
gas valve driver circuit  
1. Cycle power to the water heater off for 10 seconds  
and then back on.  
2. If the above step did not cleat the error, the  
INTELLI-VENT™ control must be replaced  
A
B
C
7
8
9
The self diagnostic test has 1. Cycle the external power off for 10 seconds and  
detected a problem with then back on.  
the internal microcomputer. 2. If the above step does not clear the error, the  
INTELLI-VENT™ control must be replaced.  
A
A
B
B
C
C
The self diagnostic test has 1. Cycle the external power off for 10 seconds and  
detected a problem with  
the internal circuit  
then back on.  
2. If the above step does not clear the error, the  
TM  
INTELLI-VENT control must be replaced.  
Flame signal sensed out of 1. Replace the INTELLI-VENT™ control.  
proper sequence.  
A
A
B
B
C
C
1
0
1
The high temperature ther- 1. Replace the INTELLI-VENT™ control.  
mal cutoff is open  
1
1
The diagnostic test has de- 1. Make sure that there are no objects leaning against  
A
B
C
2
tected one of the tempera-  
ture adjust buttons stuck  
closed  
the front of the control.  
2. Lightly press and release each of the buttons once.  
. If the above actions do not clear the error, the  
control will continue to regulate water temperature  
at the last setting, but you not be able to change  
settings unless you replace the INTELLI-VENT™  
control.  
3
The self diagnostic test  
1. Check that all wiring is correct and that there are no  
open or shorted circuits.  
2. If no wiring problems are found the INTELLI-VENT™  
control must be replaced.  
A
A
B
B
C
C
1
1
3
4
has detected that the water  
temperature sensor is ei-  
ther open or short circuited.  
The self diagnostic test  
found a problem with the  
Flammable Vapor Sensor  
1. Check that all wiring is correct and that there are no  
open or shorted circuits.  
2. If no wiring problems are found the flammable  
Vapor Sensor must be replaced by qualified service  
person.  
The control detected the  
presence of flammable  
vapors near the appliance  
and entered lockout.  
1. If you smell gas, STOP! Follow the instructions,  
“What to do if you smell gas” on page 1 of this  
instruction sheet. Otherwise call a qualified service  
person for replacement of the control.  
A
B
C
1
5
White-Rodgers is a division  
of Emerson Electric Co.  
The Emerson logo is a  
trademark and service mark  
of Emerson Electric Co.  
www.white-rodgers.com  
www.emersonclimate.com  

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