58 • MN-35949 • Rev 04 • 06/16 • Combitherm® CT PROformance™ Series • Technical Service Manual
Error Codes
Error
Code
Error Call Out in Display Description of Error Possible Cause(s)
E90 Lower Gas Combustion Blower
Not at Speed
Speed is too slow. — Power supply cable is not connected to blower motor.
— Speed control cable is not connected to blower motor.
— Blower motor is blocked, rotation is impeded, or motor is
faulty.
— Faulty control board.
E91 Upper Gas Blower Not at
Speed
Speed is to slow. — Power supply cable is not connected to blower motor
— Speed control cable is not connected to blower motor
— Blower motor is blocked, rotation is impeded, or motor is
faulty
— Faulty control board
E92 Communication Error
CB does not properly respond
Twelve (12) instances of no-
response from the relay board
(CB) to the display board (IB).
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E93 Interface Board (IB) and
Control Board (CB) are in
diff erent states
The IB is in a diff erent running
state than the CB for more than
20 seconds.
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E94 Communication Error,
TO Interface Board
No signal transfer for more than
5 seconds between the Interface
Board (IB) and the Control Board
(CB).
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E100 One or more maintenance
reminder has timed out.
When any maintenance
reminder has expired without
action having been taken by the
operator.
— Enter maintenance reminder screen and address the item
that has timed out and reset
E101 Ventless Hood Fault - No
Pressure
If the power switch or pressure
switch is not closed.
— Check power switch is on.
— Check vent motor is turning in the proper direction.
— Pressure switch is miss wired or defective.
— Filter(s) require cleaning or replacement
E102 Ventless Hood Fault — Filters
Not Present
If the air filter switches are not
closed.
— Check filters are installed and properly seated.
— Check filter switches are not damaged, defective or
dislodged.
E103 Option Board Doesn’t Send
Switch Setting
OB not communicating its switch
settings to the CB.
— Check CAN cable connection between OB and CB.
— Ensure CB dip switch is set to see an OB.
— Incompatible OB and CB so ware (update so ware).
— OB defective.
— CB defective.
E104 Option Board Not
Communicating
Option board is not
communicating with CB.
— Check option board CAN connection at CB and OB.
— Defective OB.
— Defective CB.
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