lp-441 Rev. 004 Rel. 000 Date 7.2.21
45
Table 22 - Lockout 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.
Code
Short Description
Long Description
Corrective Action
F35
Dual Temperature Sensor A
Error
Dual Temperature Sensor A is out of
normal operating range, meaning
the sensor is either open or shorted.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Check the Dual Temperature Sensor. Ensure it is properly wired to
the control, and that there are no breaks, cuts, or other visible issues
with the sensor wire.
4. Use an ohmmeter to check resistance on Sensor A of the Dual
Temperature Sensor.
5. Replace Dual Temperature Sensor if Sensor A fails the resistance test.
See Figure 29.
F82
Unstable Flame Lockout
The control detects an unstable
flame.
1. Manually reset the water heater.
2. Observe water heater operation.
3. If fault code occurs again check for stable gas pressure.
4. Check ignitor cable connections.
5. Check ignitor cable ground.
6. Replace cable.
7. Replace ignitor.
