Common Error Codes - Truma Combi Service Handbook

Common Error Codes

# Flashcode
4 ssss, slss
5 ssss, slsl
6 ssss, slls
8 ssss, lsss
10 ssss, lsls
18
20 sssl, slss
21 sssl, slsl
22 sssl, slls
24 sssl, lsss
25 sssl, lssl
26 sssl, lsls
45 ssls, llsl
69 slss, slsl
148 lssl, slss
Error
Current for combustion air motor too high
Current for combustion air motor too low
Current for combustion air motor too high
Recheck flash code
Plausibility of Combustion Air Sensor
Yellow indicator light flashes (9) times
Plausibility of NTC Water Temperature Sensor
Plausibility of NTC Room Temperature Sensor
Plausibility of NTC Air Temperature Sensor
Current for air circulation motor too high
Current for air circulation motor too low
Current for air circulation motor too high
No 120VAC supply to Combi
Current monitoring for air circulation motor
with CP Plus – software error
Overtemperature of the Combustion Air
Temperature Sensor
Error Info
Combustion air motor, cable
harness, or PCB fault
Combustion air motor, cable
harness, or PCB fault
Combustion air motor, cable
harness, or PCB fault
Electronic fault – Failure in PCB
Combustion Air Sensor outside
of tolerance range – sensor or
harness
Warm air outlets blocked
circulated air intake blocked
Water Temperature Sensor
outside tolerance range –
sensor/harness, excessive temp
Room Temperature Sensor
outside tolerance range –
sensor/harness, excessive temp
Air Temperature Sensor outside
tolerance range –
sensor/harness, excessive temp
Air circulation motor or PCB
fault
Air circulation motor or PCB
fault
Air circulation motor or PCB
fault
Fault in 120VAC power supply,
WECO manual reset switch
engaged
Air circulation motor, CP Plus
(before C01.04.01), or PCB
fault
Combustion Air Sensor outside
tolerance range –
sensor/harness, excessive temp
Action
Go to Blue Pages:
Check Combustion Air
Motor, then PCB
Go to Blue Pages:
Check Combustion Air
Motor, then PCB
Go to Blue Pages:
Check Combustion Air
Motor, then PCB
Restart heater, replace
electronics
Go to Blue Pages:
Check Combustion Air
Sensor
Inspect individual outlet
apertures, remove air
intake blockage.
Allow system to cool
Go to Blue Pages:
Check WTS
Allow system to cool
Go to Blue Pages:
Check RTS
Allow system to cool
Go to Blue Pages:
Check ATS
Go to Blue Pages:
Check Air Circulation
Motor, then PCB
Go to Blue Pages:
Check Air Circulation
Motor, then PCB
Go to Blue Pages:
Check Air Circulation
Motor, then PCB
Verify 120VAC supply
voltage/engaged GFCI,
reset WECO manual
reset switch
Go to Blue Pages:
Check Air Circulation
Motor, check CP Plus,
Check PCB
Allow system to cool
Go to Blue Pages:
Check CATS