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Appendix
Code
Meaning
F.52
Mass flow sensor connection fault
F.53
Mass flow sensor fault
F.54
Gas pressure fault (in combination with
F.28/F.29)
F.56
Fault: Mass flow sensor control
F.57
Fault during comfort protection mode
F.61
Gas valve assembly control system fault
F.62
Gas valve assembly fault, switch-off delay
F.63
Fault: EEPROM
F.64
Fault: Electronics/NTC
F.65
Fault: Electronics temp.
F.67
Fault: Electronics/flame
F.68
Fault: Unstable flame signal
F.70
Invalid device specific number (DSN)
F.71
Flow temperature sensor fault
F.72
Flow and/or return temperature sensor fault
F.73
Water pressure sensor signal in the wrong range
(too low)
F.74
Water pressure sensor signal outside correct
range (too high)
F.75
Fault: Insufficient throughput on pump start-up.
F.77
Fault: Flue non-return flap/condensate pump
F.82
External current anode fault (if installed as an
accessory)
F.83
Fault: Flow and/or return temperature sensor
temperature change
F.84
Fault: Flow/return temperature sensor temperat-
ure difference implausible
F.85
Fault: Flow and return temperature sensors
incorrectly installed
F.86
Fault: Floor contact
F.92
Fault in the gas coding resistor
52
Cause
Mass flow sensor not connected/disconnected, plug not connected or
incorrectly connected
Gas flow pressure too low, filter under Venturi filter cap wet or blocked,
mass flow sensor defective, internal pressure measuring point in Venturi
blocked (do not use lubricant on Venturi O-ring.)
No or insufficient gas inlet pressure, gas stopcock closed
Gas valve assembly defective, cable harness to gas valve assembly
defective
Ignition electrode highly corroded
–
Short circuit/short to earth in cable harness for the gas valve as-
sembly
–
Gas valve assembly defective (coils shorted to earth)
–
Electronics defective
–
Delayed shutdown of gas valve assembly
–
Delayed extinguishing of flame signal
–
Gas valve assembly leaking
–
Electronics defective
Electronics defective
Flow or return NTC short circuited, electronics defective
Electronics overheating due to external influences, electronics defective
Implausible flame signal, electronics defective
Air in gas, gas flow pressure too low, incorrect air ratio, condensate
route blocked, incorrect burner jet, ionisation flow interruption (cable,
electrode), flue gas recirculation, condensate route, electronics defective
If spare parts fitted: Display and PCB replaced at same time and DSN
not reset, incorrect or missing output range coding resistor
Flow temperature sensor signalling constant value:
–
Flow temperature sensor incorrectly positioned on the flow pipe
–
Flow temperature sensor defective
Flow/return NTC temperature difference too great → flow and/or return
temperature sensor defective
Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pressure
sensor defective
Line to water pressure sensor has a short circuit to 5 V/24 V or internal
fault in the water pressure sensor
Pump defective, air in heating installation, too little water in unit, mass
flow sensor defective
No response from flue non-return flap or condensate pump defective
Anode connection or external current anode PCB defective
When the burner starts, the temperature change registered at the flow
and/or return temperature sensor is non-existent or too small
–
Insufficient water in product
–
Flow or return temperature sensor not in correct position at pipe
Flow and return temperature sensors returning implausible values.
–
Flow and return temperature sensors have been inverted
–
Flow and return temperature sensors have not been correctly in-
stalled
The flow and/or return temperature sensors have been installed on the
same pipe/incorrect pipe
Safety thermostat when underfloor heating is switched on: Setting the
target heating value
The coding resistor on the PCB does not match the entered gas group:
Check the resistance, repeat the gas family check and enter the correct
gas group.
Installation and maintenance instructions ecoCOMPACT 0020181421_04
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