Glow-worm Compact 24c-AS/1 H-GB User Manual

Appendix
0020289288_02 MicraCom Installation and maintenance instructions 47
Message Possible cause Measure
F.64
Fault: Electronics/temperature
sensor
Flow temperature sensor short
circuit
▶ Check that the flow temperature sensor works correctly.
Return temperature sensor
short circuit
▶ Check that the return temperature sensor works correctly.
PCB defective ▶ Replace the PCB.
F.65
Electronics temperature fault
Electronics overheated ▶ Check the external heat effects on the electronics.
PCB defective ▶ Replace the PCB.
F.67
Fault: Electronics/flame
Implausible flame signal ▶ Check the flame signal.
PCB defective ▶ Replace the PCB.
Fault in the flue gas route ▶ Check the entire flue gas route.
F.68
Fault: Unstable flame signal
Air in the gas supply (e.g. dur-
ing initial start-up)
▶ Reset the unit once.
Gas flow pressure too low ▶ Check the gas flow pressure.
Incorrect air ratio ▶ Check the CO
2
content at the flue gas analysis point.
Incorrect flue gas recirculation ▶ Check the flue gas recirculation.
Condensate discharge pipe
blocked
▶ Check the condensate discharge pipe.
F.70
Invalid device specific number
(DSN)
Device Specific Number not
set/is incorrect
▶ Set the correct Device Specific Number.
F.71
Flow temperature sensor fault
The flow temperature sensor
signals a constant value
▶ Check the positioning of the flow temperature sensor.
Flow temperature sensor in the
incorrect position
▶ Check the positioning of the flow temperature sensor.
Flow temperature sensor de-
fective
▶ Replace the flow temperature sensor.
F.72
Fault: Return temperature
sensor
Flow temperature sensor de-
fective
▶ Replace the flow temperature sensor.
Return temperature sensor de-
fective
▶ Replace the return temperature sensor.
F.73
Water pressure sensor signal in
the wrong range (too low)
Short circuit in the cable har-
ness
▶ Check the cable harness.
Interruption in the cable harness ▶ Check the cable harness.
Water pressure sensor defect-
ive
▶ Replace the water pressure sensor.
F.74
Water pressure sensor signal
outside correct range (too high)
Short circuit in the cable har-
ness
▶ Check the cable harness.
Interruption in the cable harness ▶ Check the cable harness.
Water pressure sensor defect-
ive
▶ Replace the water pressure sensor.
F.76
Fault: Thermal cut-out
Defective thermal fuse ▶ Check the heat exchanger for leakages. If the heat exchanger
has no leaks, bypass the thermal fuse. If you can then start
the product, replace the thermal fuse.
F.77
Fault: Flue non-return
flap/condensate pump
No feedback from the flue non-
return flap or the feedback is
incorrect
▶ Check that the flue non-return flap functions correctly.
Flue non-return flap defective ▶ Replace the flue non-return flap.
Condensate pump defective ▶
Replace the condensate pump.
F.78
Interruption: Domestic hot water
outlet temperature sensor with
external control
NTC sensor defective ▶ Replace the NTC sensor.
F.83
Fault: NTC temperature fluctu-
ation
System pressure too low ▶ Check the system pressure.
Flow temperature sensor: No
contact
▶ Check whether the flow temperature sensor is lying against the
flow pipe correctly.
Return temperature sensor: No
contact
▶ Check whether the return temperature sensor is lying against
the return pipe correctly.

Glow-worm Compact 24c-AS/1 H-GB Specifications

General

Brand	Glow-worm
Model	Compact 24c-AS/1 H-GB
Category	Boiler
Language	English