Munchkin boiler error codes

Do you see a digit-and-letter error code on the screen? Check the table below with a list of possible errors and faults, which may occur as you use your boiler. There is a description to each code in the opposite column, which explains possible causes and solutions.

Munchkin HeatTransfer  boiler error codes

CODESCAUSE/SOLUTIONS
Munchkin error codeAn error code may occur in the installation of the Munchkin. This condition may lead to a lock out condition of the controller, which will need to be manually reset through the S4/Reset button. These temporary codes will help the installer correct the problem before going into a lock out condition, which will require a manual reset.
Boiler error1. When an error condition occurs the controller will display an error code on the display module.
2. In the case of E00, E13, and E14 this error, if uncorrected, will go into a fault condition.
Boiler fault1. When a fault condition occurs the controller will illuminate the red "fault" indication light and display a fault code in the format (Example: E21) on the display module.
2. Press the reset key to clear the fault and resume operation. Be sure to observe the operation of the unit to prevent a recurrence of the fault.

CodeDescriptionRemedy
F00High Limit Exceeded.1. Check circulation pump operation
2. Assure that there is adequate flow through the heater by accessing the status menu and assuring that there is less than a 50°F rise from the return thermister to the supply thermister.
3. Check thermister reading on supply thermister. Replace switch if faulty.
F01Vent Temperature Limit Switch Exceeded.1. Push the red reset button on the vent temperature limit switch.
2. Check the flue temperature during operation using a combustion analyzer.
3. Replace the vent limit switch if faulty.
F02Interrupted or Shorted Supply (Outlet) Thermister.1. Check the electrical connection to the thermister on the outlet manifold.
2. Replace thermister if necessary.
F03Interrupted or Shorted Return (Inlet) Thermister.1. Check the electrical connection to the thermister on the inlet manifold.
2. Replace thermister if necessary.
F05Supply (Outlet) Temperature exceeds 230°F.1. Check circulation pump operation.
2. Assure that there is adequate flow through the heater by accessing the status menu and assuring that there is less than a 50°F rise from the return thermister to the supply thermister.
F06Return (Inlet) Temperature Exceeded 230°F.1. Check circulation pump operation.
2. Assure that there is adequate flow through the heater by accessing the status menu and assuring that there is less than a 50°F rise from the return thermister to the supply thermister.
F09 (error solution F09)No flame detected - The heater 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 Vi" gap. Use 2 quarters together as a gauge to check gap distance.
3. Remove any corrosion from the spark electrode and flame rectifier probe.
4. If there is a spark but no flame, check the gas supply to the heater.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.
F10Loss of Flame Signal - The heater will relight 4 times before the control goes into this lockout condition.1. Monitor the gas pressure to the unit while 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 heater 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 rectifier probe.
6. If the flame rectifier probe continues to read low, replace it.
F11False Flame Signal-The heater 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 igniter.
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.
F13Combustion Fan Speed Low-The heater will lock out if it senses that the fan speed is less than 70% of expected rate for more than 60 seconds.1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
F14Combustion Fan Speed High - The heater will lock out if the fan speed is more than 130% of expected rate for more than 60 seconds.1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
F18Gas Valve Error1. 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 low voltage wiring harness assembly.
4. Replace control board.
F30WatchdogCall factory for further assistance.
F31Parameter Memory
F32Parameter Memory Write Error
F33Programming Error

CodeDescriptionDurationCorrective Action
F00High Limit Exceeded50 Sec.Check circulation pump operation.
Assure that there is adequate flow through the boiler by accessing the status menu and assuring that there is less than a 50°F rise from the return thermister to the supply thermister.
Replace switch if faulty.
E13Combustion Fan Speed Low. The boiler combustion air fan speed less than 70% of expected.60 Sec.Check the combustion air fan wiring.
Replace the combustion air fan.
Replace the control board.
E14Combustion Fan Speed High. The boiler combustion air fan speed is more than 130% of expected.60 Sec.Check the combustion air fan wiring.
Replace the combustion air fan.
Replace the control board.
FLOFlow Switch OpenUntil CorrectedAssure that high velocity pump is operational.
Check pump impeller.
Check flow switch and paddle wheel.