149 lssl, slsl Overtemperature of the Water Temperature
Switch or Air Temperature Switch
Water Temperature Switch or
Air Temperature Switch out of
range – sensor/harness,
excessive temperature
Allow system to cool
Go to Blue Pages:
Check WECO, Check
AECO
150 lssl, slls Overtemperature of the Air Temperature
Switch or Water Temperature Switch
Air Temperature Switch or
Water Temperature Switch out
of range – sensor/harness,
excessive temperature
Allow system to cool
Go to Blue Pages:
Check AECO, Check
WECO
112 slll, ssss Combustion Failure: Flame not detected Flame was not detected during
ignition sequence – potential
combustion issue (air, fuel,
spark)
1)
ON position 2) Check
supply gas pressure 3)
Check condition of
exhaust and intake -
properly installed, no
damage 4) Ensure
proper grounding and
incoming 12vdc 5) Allow
system to cool and
restart Go to blue
pages: 6) Check ignitor
7) check gas valve 8)
Check PCB
121 slll, lssl Combustion Failure: Flame unstable Flame unstable during
operation – potential
combustion issue (air, fuel,
spark)
Same steps as #112
122 slll,lsls Combustion Failure: Flame not detected Flame was not detected during
ignition sequence – potential
combustion issue (air, fuel,
spark)
Same steps as #112
202 llss, lsls Combustion Failure: Flame not detected Flame was not detected during
ignition sequence – potential
combustion issue (air, fuel,
spark)
Same steps as #112
211 llsl, ssll Combustion Failure: Flame unstable Flame unstable during
operation – potential
combustion issue (air, fuel,
spark)
Same steps as #112
212 llsl, slss Combustion Failure: Flame not detected Flame was not detected during
ignition sequence – potential
combustion issue (air, fuel,
spark)
Same steps as #112
255 CP Plus – Combi communication and/or
12VDC failure
Combi 12VDC supply power
inadequate or non-existent or
communication failure between
Combi and CP Plus
Verify 12VDC supply
voltage between 11-
15VDC, check CP Plus,
Data Cable, CP Plus 1A
Fuse
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