56 • MN-35949 • Rev 04 • 06/16 • Combitherm® CT PROformance™ Series • Technical Service Manual
Error
Code
Error Call Out in Display Description of Error Possible Cause(s)
E23 B4 Boiler Probe Fault Boiler temperature probe
defective or disconnected
— B4 boiler temperature probe defective.
— B4 probe wires connected backwards.
E24 B5 Bypass Probe Fault Bypass steam temperature probe
defective or disconnected
— B5 bypass steam temperature probe defective.
— B5 bypass steam temperature probe wires connected
backwards.
E25 B3 Condensor Probe Fault Condensor water temperature
probe defective or disconnected.
— B3 condensor temperature probe defective.
— B3 condensor probe wires connected backwards.
E26 N8 Boiler Safety Temperature
Probe Fault
Boiler heating element
protection probe defective or
disconnected.
— N8 boiler temperature probe defective.
— N8 probe wires connected backwards.
E27 Boiler Element Temperature
High
Boiler protection heat element
temperature detected by N8
probe is more than 266°F (130°C)
for more than 25 seconds, or has
reached 275°F (135°C).
— Calcium build up in boiler.
— Check wiring to all components mentioned below.
— Steam element contactor locked/on.
— N8 boiler temperature probe defective.
— N8 probe wires connected backwards.
— Water level probe has calcium buildup.
E34 Steam Generator Drain Pump
Fault
If water level does not drop
below lower water level probe
a er three minutes when
steam generator drain pump is
activated in cleaning program.
— Calcium build up in steam generator drain pump.
— Boiler drain pump defective.
— Relay board, high voltage, defective.
— Water level probe defective.
E36 Steam Temperature High In Steam program, cavity
temperature N6 is measuring in
excess of 395ºF (200ºC) for more
than 60 Seconds.
In Combination program, cavity
temperature N6 is measuring in
excess of 520ºF (270ºC), for more
than 60 Seconds.
In Retherm program, cavity
temperature N6 is measuring in
excess of 395ºF (200ºC), for more
than 60 Seconds.
In Cleaning program, cavity
temperature N6 is measuring in
excess of 395ºF (200ºC), for more
than 60 Seconds.
— Water supply is shut off .
— Low water pressure.
— Water injection pipe, calcium build up.
— Water flow valve defect or calcium build up.
— Double water solenoid valve defective (Y1).
— Relay board, high voltage, defective.
E40 B3 Fault B3 probe shorted to ground — Defective or miss wired probe.
E41 B4 Fault B4 probe shorted to ground — Defective or miss wired probe.
E42 B5 Fault B5 probe shorted to ground — Defective or miss wired probe.
E43 N6 Fault N6 probe shorted to ground — Defective or miss wired probe.
E44 N8 Fault N8 probe shorted to ground — Defective or miss wired probe.
E45 B10 Fault B10 probe shorted to ground — Defective or miss wired probe.
continued on next page
Error Codes
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