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Fault Code F01
This display indicates that the flue temperature limit switch of the unit has tripped. This is a serious safety
issue, as indicated by the red fault light and the word LOCKOUT flashing on the display. The unit will not
restart until the flue cools down sufficiently and a technician repairs the cause of the problem and pushes
the RESET button on both the device and the display. During this lockout fault, the pump will be on as
indicated on the second line of the display.
Remedy:
1. Check the flue for obstructions or any sign of damage (especially signs of excessive heat). Repair as
necessary.
2. Push the red reset button on the flue temperature switch located on CPVC vent elbow. NOTE: Switch
temperature must be less than 90°F to reset.
3. Press RESET on the display. Run the unit and check the flue temperature by using an external
thermometer in the flue pipe. If the flue temperature is below 190°F and the switch trips, replace the
switch. If the flue temperature is excessive, check and adjust the combustion controls on the unit.
Fault Code F02
This display indicates that the top temperature sensor of the tank has failed. This code indicates a serious
safety issue by the red fault light and the word LOCKOUT flashing on the display. The unit will not restart
until a technician replaces the sensor and resets the unit. During this lockout fault, the circulator pump will
be on as indicated on the second line of the display.
Remedy:
1. Check the electrical connection to the thermistor on the outlet manifold. Verify 5 VDC by checking in
Molex connector. If no 5 VDC, check harness. If harness is OK, replace control. NOTE: Verify thermistor
values by referencing chart in this manual.
2. Replace thermistor if necessary.
Fault Code F03
This display indicates that the bottom temperature sensor of the unit has failed. This code indicates a
serious safety issue by the red fault light and the word LOCKOUT flashing on the display. The unit will not
restart until a technician replaces and resets the unit. During this lockout fault, the pump will be on as
indicated on the second line of the display
Remedy:
1. Check the electrical connection to the thermistor. Check the wire harness. If harness is OK, replace
control. NOTE: Verify thermistor values by referencing chart in this manual.
2. Replace thermistor if necessary.
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