MN-29805 • Rev 10 • 06/17 • Combitherm CT Express Installation Manual
43
Service
Error
Code
Error Call Out in Display
Description of Error
Possible Causes
E27
N8 Immersion Element
Temperature Too High
Immersion element too hot
— Scale buildup inside steam generator and/or on water level probe.
— Immersion element contactor stuck closed.
— Faulty N8 safety temperature probe.
E34
Steam Generator Drain
Pump Fault
Water level in steam
generator does not drop
during cleaning program
— Scale buildup inside the steam generator and/or water level probe.
— Obstruction on inlet side of steam generator drain pump.
— Boiler steam generator pump not being energized.
— Steam generator drain pump defective.
E36
Steam Temperature High
Oven cavity temperature
is too high when operating
in steam mode or
combination mode
— Water supply is not connected or shut off .
— Low water pressure.
— Y1 solenoid valve not energized on a call for steam.
— Y1 solenoid faulty.
— Flow restrictor obstructed.
— Water injection pipe obstructed.
— Steam bypass hose obstructed.
— B5 steam bypass probe dirty or faulty.
E51
No Water In Boiler
Steam generator fill error
— Water supply is disconnected or shut off .
— Low water pressure.
— Boiler drain cap leaking or missing.
— Boiler drain pump defective.
— Drain pump elbow leaking.
— Fill solenoid not energized.
— Fill solenoid faulty.
— Connection/wiring error at the solenoid or the relay board.
— Water level probe connection/wiring error at probe or the
relay board.
— Water level probe requires descaling and/or replacement.
E53
Fan Motor High
Temperature
Fan motor high limit
— Faulty motor high limit connection at relay board.
— Obstructed fan wheel.
— Faulty convection motor.
E54
Lower Fan Motor High
Temperature
(20-20 unit size only)
Fan motor high limit
— Faulty motor high limit connection at relay board.
— Obstructed fan wheel.
— Faulty convection motor.
E55
Vent Not Open
Browning valve does
not open
— Browning valve vent motor not being energized.
— Alignment issue between motor cam and vent motor safety switch
(micro switch).
— Faulty connection at vent motor, vent motor switch or relay board.
— Fault vent valve safety switch (micro switch).
— Faulty vent motor.
Error Codes
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