trouble shooting
COMBITHERM® CT PROFORMANCE™ SERIES • STEP-BY-STEP PROCEDURES • MN-35948 • 58.
ERROR CODES
Error
Code
Error Call Out in Display Description of Error Possible Cause
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 mentioned
below.
— 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 mentioned
below.
— 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 mis-wired or defective.
— Filter(s) require cleaning or replacement
E102
Ventless Hood Fault —
Filters Not Present
If the air fi lter switches are
not closed.
— Check fi lters are installed and properly seated.
— Check fi lter 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 software (update
software).
— 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.
E105
No or Low Water Pressure Water pressure switch not
activated.
— Water supply not connected.
— Water supply is shut off.
— Water supply to unit blocked or obstructed
— Faulty or miswired pressure switch
E106
Boiler Drain Pump Fault Hall effect or rotational
sensor is not sending a signal
to the relay board
— Drain pump motor not running or defective.
— Hall effect sensor broken or incorrectly wired.
— Motor improperly wired.
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