77110331-01 - 5/20
PHTM II
Installation, Operating & Service Instructions
19 Troubleshooting (continued)
Table 19-5: Active Fault Code and Corrective Actions (continued)
Code Name Possible Causes Corrective Action
E18
Invalid
Application
Parameters
[18.7] Factory defaults not
turned on.
Ensure BCC is installed and select A10 factory Default
"On" see Table 16-11.
[18.8] Pump mismatch
Boiler pump set to 0 or boiler pump output set to 3 and
Aux. pump ouput is not set to 3.
E19
Gas Valve Or
Blower Fault
Air fuel ratio is persistently
outside acceptable limit.
Check wiring to gas valve and blower. If wiring is OK,
replace blower and retry. If wiring OK, replace gas valve
and retry.
H20
E20
Ignitor/flame
sensor Or
Burner Fault
Dirty/damaged ignitor/flame
sensor
• Refer to Section 18 Service and Maintenance for proper
procedure to check ignitor/flame sensor.
• Check ignitor/flame sensor distance to burner.
• Replace if necessary.
Ignitor/flame sensor wiring
issue.
Check the ignitor/flame sensor wiring and earth contacts
at burner.
Dirty/ damaged burner.
• Refer to Section 18 Service and Maintenance for proper
procedure to check burner.
• Replace burner if necessary.
H21
E21
Gas Valve
Fault
[E21.3] Gas valve wiring
problem.
Check wiring to gas valve.
Defective Gas Valve.
If problem persists, replace gas valve.
If problem persists, replace control.
H22
E22
No Flame At
Ignition
No gas, insufficient gas supply
pressure.
Verify no air in gas line. Check gas supply pressure.
Check gas pressure down stream of valve.
Ignition Cable not plugged in. Connect ignition harness, check cable has continuity.
Fuel Gas Selection, parameter
A06 or gas valve position is
incorrect.
Check Fuel Gas Selection, parameter A06 and fuel gas
valve setting. Both selections must be set to the same fuel
type. Refer to Figure 15-3.
Lean ignition mixture
After verifying no air in gas piping, gradually increase (1%
at a time) F07 until successful ignition.
H23
E23
Flame Out
Of Sequence
Blocked Condensate Trap. Check trap and clean if necessary.
Ignitor/flame sensor or burner
fault.
Check ignitor/flame sensor or burner (i.e. burner can
touch ignitor/flame sensor if welding is damaged.
Ignitor/flame sensor wiring
faulty.
Check ignitor/flame sensor wiring.
H24
E24
No Flame
After Ignition
Gas supply pressure dropped
after gas valve opened.
Check regular gas flow to boiler and verify no air in gas
line.
Wind => raised min. capacity
valley.
Let the system work with raised min. capacity.
Ignitor/flame sensor or burner
fault.
Check ignitor/flame sensor or burner (e.g. burner can
touch ignitor/flame sensor if welding is damaged),
replace if necessary.
Blocked condensate trap. Check the condensate trap and clean if necessary.
Fuel Gas Selection, parameter
A06 or gas valve position is
incorrect.
Check Fuel Gas Selection, parameter A06 and fuel gas
valve setting. Both selections must be set to same fuel
type. Refer to Figure 15-3.
Control damaged. Replace control if necessary.
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