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110327-07 - 2/23
ALTA
Combi Installation, Operating & Service Instructions
19
Troubleshooting
(continued)
H24
E24
No Flame
After Ignition
No gas, insufficient gas supply
pressure.
Verify no air in gas line. Check gas supply pressure.
Check gas valve inlet pressure during operation.
The boiler has not started due to
high winds.
The control automatically raised the minimum capacity
value to help prevent high wind from preventing ignition
again. Minimum capacity is returned to normal after one
hour.
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
), Altitude Selection
(parameter
A07
) or gas valve
setting is incorrect.
Check Fuel Gas Selection, parameter
A06
, and gas
valve setting (Figure 15-3). Both selections must be set to
same fuel type. Also, check Altitude Selection (parameter
A07
) is correct for installation elevation.
Control damaged.
Replace control if necessary.
Table 19-5: Active Fault Code and Corrective Actions (continued)
Detailed Fault Code found on "
b
" and "
c
" menus in brackets, e.g. [
1
.
0
].
Code
Name
Possible Cause
Corrective Action
H22
E22
No Flame At
Ignition
No gas, insufficient gas supply
pressure.
Verify no air in gas line. Check gas supply pressure.
Check gas valve inlet pressure during operation.
Ignition cable not plugged in.
Connect ignition harness, check cable has continuity.
Fuel Gas Selection, parameter
A06
or gas valve setting is
incorrect.
Check Fuel Gas Selection, parameter
A06
, and gas valve
setting (Figure 15-3). Both selections must be set to the
same fuel type.
Lean ignition mixture
After verifying no air in gas piping and gas supply
pressure, gradually increase (1% at a time) parameter
F07
until successful ignition.
Dirty or damaged ignitor/flame
sensor
Check and correct ignitor/flame sensor gap and distance
to burner. Replace if necessary.
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),
replace if necessary.
Ignitor/flame sensor wiring
faulty.
Check ignitor/flame sensor wiring.
Defective gas valve.
Check gas valve inlet pressure during operation and
check wiring to gas valve.
If problem persists, replace gas valve.
If problem persists, replace control.
