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Fault messages
(cont.)
Displayed fault
System characteristics
code
F.62
Burner in a fault state
F.63
Burner in a fault state
F.67
Burner in a fault state
F.68
Burner in a fault state
Cause
High limit safety cut-out
has responded.
Flue gas temperature lim-
iter has responded.
Ionisation current lies out-
side the permissible range
Flame signal is already
present at burner start.
Troubleshooting
Measures
Check heating system fill level.
■
Check pre-charge pressure in di-
■
aphragm expansion vessel. Ad-
just to required system pressure.
Check whether flow rate is suffi-
■
cient (flow sensor and circulation
pump).
Check 3-way diverter valve func-
■
tion in actuator test. Vent the sys-
tem.
Reset the appliance.
Check heating system fill level.
■
Check pre-charge pressure in di-
■
aphragm expansion vessel. Ad-
just to required system pressure.
Check whether flow rate is suffi-
■
cient (flow sensor and circulation
pump).
Check 3-way diverter valve func-
■
tion in actuator test.
Vent the system.
Reset the appliance once the flue
system has cooled down.
Check gas supply (gas pressure
and gas flow switch), check gas
solenoid valve and inlet strainer.
Check ionisation electrode for the
following:
Clearance to burner gauze as-
■
sembly
Check electrode/burner gauze
■
assembly for contamination.
If specified measures don't help,
replace fan unit.
Reset the appliance.
Close the gas shut-off valve. Re-
move connecting cable of the ioni-
sation electrode. Reset the appli-
ance.
If the fault persists, replace BCU
burner control unit: See page 100.
81
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