0020308118_05 Installation and maintenance instructions 89
Code/meaning Possible cause Measure
F.096
The gas valve stepper motor
has reached the maximum per-
missible step number.
Air-mass flow sensor dirty or
defective (only in conjunction
with the conversion set compris-
ing the air intake pipe with in-
tegrated non-return valve and
air-mass flow sensor)
1. Check the air-mass flow sensor for dirt.
2. If required, replace the entire air intake pipe.
F.097
The self-test of the main PCB
has failed.
PCB self-test failed (PCB de-
fective)
▶ Replace the PCB.
F.105
If the gas valve or the PCB and
the unit interface are replaced,
the gas valve offset must be set
in accordance with the current
gas valve.
Gas valve assembly offset in-
correctly stored in D.052 und
ggf. D.182
▶ Check the offset setting for the gas valve assembly.
Fault in the electrical connection
for the gas valve assembly
▶ Check the wiring harness between the PCB and gas valve
assembly, incl. all plug connections.
F.194
The power supply unit for the
PCB is defective.
Power supply unit for the PCB
is defective
▶ Replace the PCB.
F.195
The unit has detected signific-
ant undervoltage in the power
supply.
Undervoltage in the power sup-
ply
▶ Check the mains voltage.
▶ If the mains voltage is not correct, contact the energy supply
company.
Pump defective ▶
If the mains voltage is correct, replace the pump (voltage
measurement via pump electronics).
Fault in the electrical connection
for the pump
▶ Check the wiring harness between the PCB and pump, includ-
ing all plug connections.
F.196
The unit has detected signific-
ant overvoltage in the power
supply.
Overvoltage in the power supply ▶ If the mains voltage is not correct, contact the energy supply
company.
Pump defective ▶ If the mains voltage is correct, replace the pump (voltage
measurement via pump electronics).
Fault in the electrical connection
for the pump
▶ Check the wiring harness between the PCB and pump, includ-
ing all plug connections.
F.317
The signal for the volume flow
sensor in the domestic hot wa-
ter circuit is implausible.
Fault in the electrical connection
for the volume flow sensor in
the domestic hot water circuit
▶ Check the wiring harness between the PCB and volume flow
sensor, including all plug connections.
Volume flow sensor in the do-
mestic hot water circuit defect-
ive
▶ Replace the volume flow sensor in the domestic hot water cir-
cuit.
F.318
The 3-port motorised valve
does not move.
Fault in the electrical connection
for the 3-port diverter valve
▶ Check the wiring harness between the PCB and 3-port diverter
valve, including all plug connections.
3-port diverter valve defective or
blocked
▶ Check and, if required, replace the 3-port diverter valve.
F.320
The heating pump is blocked.
The unlocking function was not
successful.
Dirt or foreign bodies in the
pump
▶ Clean the pump and, if required, replace the pump.
F.321
The pump electronics are de-
fective.
The pump is defective. ▶ Check and, if required, replace the pump.
F.322
The heating pump has over-
heated. The temperature could
not be lowered by the limp
home mode.
The pump temporarily reports
excessive temperatures in the
electronics
▶
Check the pump and, if required, replace the pump.
F.323
The heating pump is dry run-
ning.
Air in the product ▶ Purge the heating installation.
Pump has been dry-running ▶ Replace the pump.
F.324
The electrical connection to the
pump has been interrupted.
The cable to the pump is de-
fective
▶ Check the cable for the 230 V power supply to the pump and,
if required, replace the cable for the 230 V power supply.
The pump is defective. ▶ Check and, if required, replace the pump.
F.325
The heating pump has a fault.
Pump blocked ▶ Check that the pump is working correctly.
The pump is defective. ▶ Check and, if required, replace the pump.
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