trouble shooting
COMBITHERM® CT PROFORMANCE™ SERIES • STEP-BY-STEP PROCEDURES • MN-35948 • 56.
ERROR CODES
Error
Code
Error Call Out in Display Description of Error Possible Cause
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 is more
than 266°F (130°C) for more
than 25 seconds, detected by
N8 probe.
— 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 after 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 fl ow 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 miswired probe.
E41
B4 Fault B4 probe shorted to ground — Defective or miswired probe.
E42
B5 Fault B5 probe shorted to ground — Defective or miswired probe.
E43
N6 Fault N6 probe shorted to ground — Defective or miswired probe.
E44
N8 Fault N8 probe shorted to ground — Defective or miswired probe.
E45
B10 Fault B10 probe shorted to ground — Defective or miswired probe.
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