LP-454 Rev. 004 Rel. 002 Date 12.1.17
36
926 Control Board Fault Codes
Code Description Corrective Action
F00
High temperature switch limit
exceeded 194
o
F
1. Try to reset the water heater. If F00 repeats, create a demand for hot water. (WARNING: Use
caution to prevent burn injury.) If water is above 194
o
F, test upper and lower temperature
sensors with an ohmmeter. (Refer to resistance chart, this section.) Replace bad sensor.
If water is below 194
o
F, test high temperature switch and wiring with ohmmeter. Switch
should be closed at this point. If not, replace switch.
2. If heater did reset successfully, let the heater run and go into the status menu to check
the upper and lower temperature sensors. If either reading displayed does not make sense,
check appropriate sensor with ohmmeter. (Refer to resistance chart, Table 15.) Replace bad
sensor. Do an OHMs reading on both sensors to check continuity.
F01 Vent temperature limit exceeded
1. Inspect all ue piping. If the ue is damaged or shows signs of overheating, repair or
replace the ue parts as necessary before proceeding.
2. If the ue piping is intact, undamaged, and there is no sign of the ue overheating (such
as discoloration or melting of the ue pipe), push the red reset button on the ue switch.
3. Be sure the heater is connected to a water supply and is full of water.
4. Push the RESET button on the heater control panel. The water heater should light. If the
water heater lights, proceed to step 5. If the water heater does not light and the display
again begins to ash F01, inspect the wiring to the ue switch, repairing or replacing as
necessary. If the wiring is intact, replace the ue switch, using care to mount the new ue
switch in the same position and mounting holes as the old one. If the display ashes a
code other than F01, follow the troubleshooting guide for the code.
5. Observe operation for 5 minutes. Place the probe of an exhaust analyzer into the ue
system within 6 feet of the heater. The exhaust temperature should not rise above 190
o
F
after several minutes of operation.
6. If the ue temperature is below 190
o
F and the heater again goes into lockout displaying
F01, replace the ue switch, using care to mount the new ue switch in the same position
and mounting holes as the old one. If the display ashes a code other than F01, follow the
troubleshooting guide for that code.
7. If the ue temperature increases to over 190
o
F, consult HTP for further assistance.
F02
Interrupted or shorted upper
temperature sensor
1. Check the electrical connection to the appropriate temperature sensor.
2. If connection is intact, replace the sensor.
F03
Interrupted or shorted lower
temperature sensor
F05 Upper temp. sensor exceeds 194
o
F 1. If water in tank is less than 194
o
F, check wiring. Repair if damaged.
2. If wiring is intact, check appropriate sensor with ohmmeter and compare to reading in
Table 15. If reading does not agree with water temperature, replace the sensor.
F06 Lower temp. sensor exceeds 194
o
F
F09
No ame detected - Heater will make
three attempts at ignition before
the control goes into this lockout
condition. Will reset in 1 hour.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper 1/4” gap.
3. Remove any corrosion from the spark electrode and ame rectier probe.
4. If there is a spark but no ame, check the gas supply to the heater.
5. If there is a ame, check the ame sensor.
6. Check for any ue or condensate blockages.
F10
Loss of ame signal - The heater will
attempt to relight four times before
the control goes into this condition.
Will reset in 1 hour.
1. Monitor the gas pressure to the unit while in operation.
2. Assure that the ame is stable when lit.
3. Check to see if the green light on the display module is out while the heater is running.
4. If the green light doesn’t come on or goes o during operation check the ame signal
on the status menu.
5. If the signal reads less than 1 microampere, clean the ame rectier probe.
6. If the ame rectier probe continues to read low, replace it.
F11
False ame signal - Occurs if heater
senses a ame signal when there
should be none present.
1. Turn the gas o to the unit as the service valve.
2. If the ame signal is still present replace the igniter.
3. If the ame signal is not present after turning o the gas supply, check the gas valve
electrical connection.
4. If there is no power to the gas valve, remove the valve and check for obstruction in the
valve seat or replace the gas valve.
5. Turn the gas on at the service valve after corrective action is taken.
F13
Blower speed incorrect - Occurs
if blower speed is less than 70%
expected for more than 60 seconds.
1. Check blower wiring.
2. Replace the blower.
3. Replace the control board.
Table 17 - Fault Codes - NOTE: If you replace a part to remedy a fault, it is recommended that you cycle the water heater at least three or four times
to assure the fault has been resolved.
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