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Fault
Code
Description Corrective Action
F00
High Limit Exceeded.
1. Check circulation pump operation.
2. Assure that there is adequate flow through the boiler by accessing the status menu
and confirming that there is less than a 50°F rise from the return thermistor to the
supply thermistor.
3. If gray thermostat wires are being used, disconnect them and jump them together.
If F00 code can be reset check thermostat circuit for short circuit or stray voltage.
4. Check supply temperature reading on LED display. Replace High Limit Switch if
supply temperature is below 210°F.
5. Temporarily jump out Water Pressure Switch. If F00 code can be reset check wiring
harness and connections. If wiring harness is okay replace Water Pressure Switch.
F01
Vent Temperature Limit Exceeded.
1. Push the red reset button on the switch.
2. Check the flue temperature during operation using a combustion analyzer.
3. Replace the switch if faulty.
F02
Interrupted or Shorted
Supply (Outlet) Thermistor.
1. Check the electrical connection to the thermistor on the outlet manifold.
2. Replace thermistor if necessary.
F03
Interrupted or Shorted
Return (Inlet) Thermistor.
1. Check the electrical connection to the thermistor on the inlet manifold.
2. Replace thermistor if necessary.
F05
Supply (Outlet)
Temperature exceeded 230°F.
1. Check circulation pump operation.
2. Assure that there is adequate flow through the boiler by accessing the status menu
and confirming that there is less than a 50°F rise from the return thermistor to the
supply thermistor.
F06
Return (Inlet) Temperature
exceeded 230°F.
1. Check circulation pump operation.
2. Assure that there is adequate flow through the boiler by accessing the status menu
and confirming that there is less than a 50°F rise from the return thermistor to the
supply thermistor.
F09
No flame detected – The boiler will make three
attempts at ignition before the control goes into
this lockout condition.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper ¼" gap.
3. Remove any corrosion from the spark electrode.
4. If there is a spark but no flame, check the gas supply to the boiler.
5. If there is a flame, check the flame sensor.
F10
Loss of Flame Signal – The boiler will relight 4
times before the control goes into this lockout
condition.
1. Check the gas pressure to the gas valve while the unit is in operation.
2. Assure that the flame is stable when lit.
3. Check to see if the green light on the display module is out while the boiler
is running.
4. If the green light doesn't come on or goes off during operation check the flame
signal on the status menu.
5. If the signal reads less than 1 microampere, clean the flame sensor.
6. If the sensor continues to read low, replace it.
F11
False Flame Signal – The boiler will lock out if
it senses a flame signal when there should be
none present.
1. Turn the gas off to the unit at the service valve.
2. If the flame signal is still present replace the flame rod.
3. If the flame signal is not present after turning off 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
Combustion Fan Speed Low – The boiler will
lock out if it senses that the fan speed is less than
70% of expected for more than 60 seconds.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
F14
Combustion Fan Speed High – The boiler will
lock out if the fan speed is more than 130% of
expected for more than 60 seconds.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
F18
Gas Valve Error
1. Make sure the connector is correctly connected to the gas valve.
2. Check the electrical wiring from the valve to the control board.
3. Replace the gas valve.
4. Replace control board.
F30
Watchdog Call factory for further assistance.
F31
Parameter Memory Call factory for further assistance.
F32
Parameter Memory Write Error Call factory for further assistance.
F33
Programming Error Call factory for further assistance.
NC
Neutral Fault – Boiler locks out if it senses
a voltage drop or power feedback on the
neutral wire.
1. Check for adequate supply voltage.
2. Check for power feedback on the neutral wire.
Table 8.2: P125 Control Board Fault Codes
TROUBLESHOOTING