MN-35949 • Rev 04 • 06/16 • Combitherm® CT PROformance™ Series • Technical Service Manual • 57
Error
Code
Error Call Out in Display Description of Error Possible Cause(s)
E51 No Water In Boiler Lower water level probe B2 is
not satisfied within 5 minutes,
a er water solenoid valve Y1 is
activated
— Water supply is shut off .
— Low water pressure.
— Boiler drain cap missing.
— Boiler drain pump defective.
— Drain pump elbow leaking.
— Water level probe has calcium build up.
— Double water solenoid valve defective (Y1).
— Relay board, high voltage, defective.
E53 Fan Motor High Temperatures Fan motor does not spin, result
in over-heating, detected
by motor coil safety thermo
element. Temperature more
than 320°F (160°C).
— Motor high limit open or wired incorrectly.
— If LED on motor control flashes, see error codes for motor
control.
— Motor or fan wheel locked.
— Fan wheel damaged.
E54 Lower Fan Motor High
Temperature
Lower fan motor does not spin,
result in over-heating, detected
by motor coil safety thermo
element. Temperature more
than 320°F (160°C).
— Motor high limit open or wired incorrectly.
— If LED on motor control flashes, see error codes for motor
control.
— Motor or fan wheel locked.
— Fan wheel damaged.
E55 Vent Not Open (Lower vent on
dual vent system)
60 seconds a er the venting
motor is activated the vent
motor safety switch did not
open.
— Alignment issue between motor cam and vent motor safety
switch (micro switch).
— Faulty vent valve (motor).
— Faulty vent valve safety switch (micro switch).
E56 Vent 2 Not Open (Upper vent
on dual vent system)
60 seconds a er the venting
motor is activated the vent
motor safety switch did not
open.
— Alignment issue between motor cam and vent motor safety
switch (micro switch).
— Faulty vent valve (motor).
— Faulty vent valve safety switch (micro switch).
E57 No Rinse Water Flow switch for solenoid valve Y4
does not detect any water flow
for a minimum of 60 seconds.
— Water supply is shut off .
— Low water pressure.
— Flow switch is dirty or defective.
— Double water solenoid valve defective (Y3).
— Relay board, high voltage, defective.
E88 Lower Gas Ignition Failure
NOTE: If a er 2 attempts
to clear this error, the error
appears a third time, remove
the oven from service and
immediately contact an
Alto-Shaam authorized service
provider.
Reset output from Ignition
Module is ON
— Hot surface ignitor not functioning.
— No gas supply.
— Flame sensor not functioning.
— Faulty ignition control.
E89 Upper Gas Ignition Failure
NOTE: If a er 2 attempts
to clear this error, the error
appears a third time, remove
the oven from service and
immediately contact an
Alto-Shaam authorized service
provider.
Reset output from Ignition
Module is ON
— Hot surface ignitor not functioning.
— No gas supply.
— Flame sensor not functioning.
— Faulty ignition control.
continued on next page
Error Codes
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