Operating instructions
CT EXPRESS STEP BY STEP OPERATION -!.5!,s54
TROUBLESHOOTING
ERROR CODES
Error 
Code
Error Call Out in Display Description of Error Possible Cause
E57
No Rinse Water During rinse no water 
fl
 ow is detected through 
solenoid valve
— Water supply is shut off.
— Low water pressure.
— Check wiring to all components mentioned below.
— Flow switch is dirty or defective.
— Double water solenoid valve defective (Y3.)
— Relay board, high voltage, defective.
E88
Lower Gas Ignition Failure Ignition system has locked 
out due to a failure to create 
a consistent fl
 ame
— Hot Surface Ignitor not functioning.
— No gas supply.
— Flame Sensor not functioning.
E89
Upper Gas Ignition Failure Ignition system has locked 
out due to a failure to create 
a consistent fl ame
— Hot Surface Ignitor not functioning.
— No gas supply.
— Flame Sensor not functioning.
E92
Communication Error,
RB Does Not Properly 
Respond
Communication error 
between display board and 
relay board
— Faulty ribbon cable connections between boards.
— Faulty ribbon cable.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E93
Communication Error,
FROM Display Board
Communication error 
between display board and 
low voltage relay board
— Faulty ribbon cable connections between boards.
— Faulty ribbon cable.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E94
Communication Error,
TO Display Board
Communication error 
between display board and 
low voltage relay board
— Faulty ribbon cable connections between boards.
— Faulty ribbon cable.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E98
RB is in Celsius and DB is in 
Fahrenheit
Change the unit confi guration 
in the setup menu
— Control programming issue.
— Ribbon cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E99
RB is in Fahrenheit and DB 
is in Celsius
Change the unit confi 
guration 
in the setup menu
— Control programming issue.
— Ribbon cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E100
DB version is not equal to 
RB version. Error generated 
by DB.
Software update may have 
failed.
— Perform software update.
— Ribbon cable defective.
— Faulty compact fl 
ash card.
— Relay board, low voltage, connector defective.
— Display board connector defective.
— Software may need to be updated again.
(CONTINUED ON NEXT PAGE)










