Alto-Shaam COMBITHERM CTC Series Operation, Maintenance, Troubleshooting, Wiring Diagrams page 58

Error Codes
Error Codes
Error Error Call Out in Display
Code
E90
Lower Gas Combustion Blower
Not at Speed
E91
Upper Gas Blower Not at
Speed
E92 Communication Error
CB does not properly respond
E93
Interface Board (IB) and
Control Board (CB) are in
diff erent states
E94
Communication Error,
TO Interface Board
E100
One or more maintenance
reminder has timed out.
E101
Ventless Hood Fault - No
Pressure
E102 Ventless Hood Fault — Filters
Not Present
E103
Option Board Doesn't Send
Switch Setting
E104 Option Board Not
Communicating
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Description of Error
Speed is too slow.
Speed is to slow.
Twelve (12) instances of no-
response from the relay board
(CB) to the display board (IB).
The IB is in a diff erent running
state than the CB for more than
20 seconds.
No signal transfer for more than
5 seconds between the Interface
Board (IB) and the Control Board
(CB).
When any maintenance
reminder has expired without
action having been taken by the
operator.
If the power switch or pressure
switch is not closed.
If the air filter switches are not
closed.
OB not communicating its switch
settings to the CB.
Option board is not
communicating with CB.
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Possible Cause(s)
— 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.
— 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
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
— Enter maintenance reminder screen and address the item
that has timed out and reset
— 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
— Check filters are installed and properly seated.
— Check filter switches are not damaged, defective or
dislodged.
— Check CAN cable connection between OB and CB.
— Ensure CB dip switch is set to see an OB.
— Incompatible OB and CB soft ware (update soft ware).
— OB defective.
— CB defective.
— Check option board CAN connection at CB and OB.
— Defective OB.
— Defective CB.
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T e c h n i c a l S e r v i c e M a n u a l