Appendix
46 Installation and maintenance instructions MicraCom 0020289288_02
Message Possible cause Measure
F.29
Ignition and check faults during
operation – flame has gone out
The gas supply is interrupted ▶ Check the gas supply.
Incorrect flue gas recirculation ▶ Check the flue gas recirculation.
Earthing defective ▶ Check the product's earthing.
Ignition misfire ▶ Check that the ignition transformer works correctly.
Condensate discharge pipe
blocked
▶ Check the condensate discharge pipe.
Air/flue pipe blocked ▶ Check the air/flue pipe.
Reference pressure pipe not
connected
1. Check whether the reference pressure pipe is connected
between the gas valve assembly and the restrictor for the
reference pressure pipe.
2. Check whether the reference pressure pipe is connected
between the restrictor for the reference pressure pipe and
the distribution pipe.
F.32
Fan fault
Plug on fan not plugged in or is
loose
▶ Check the plug on the fan and the plug connection.
Multiple plug loose/not plugged
in
▶ Check the multiple plug and plug connection.
Interruption in the cable harness ▶ Check the cable harness.
Fan blocked ▶ Check that the fan works correctly.
Hall sensor defective ▶ Replace the Hall sensor.
Electronics defective ▶ Check the PCB.
F.33
Excessive pressure losses from
the air/flue system
Air/flue pipe blocked or partially
blocked
▶ Check the entire air/flue pipe.
Fan defective ▶ Check that the fan works correctly.
PCB defective ▶ Replace the PCB.
Temperature sensors defective
or not connected correctly
▶ Ensure that the electrical connection for the temperature
sensors has been established correctly, that they are not
corroded, and that they click into place correctly on the
connecting piece.
CO₂ content too low ▶ Check the CO2 setting and, if required, increase the CO₂ con-
tent while taking the tolerances into consideration. (→ Page 31)
▽ If the increase in the CO₂ content is not sufficient, set dia-
gnostics code d.85 to 10.
Presence of a shunt pump in
the circuit
▶
This product is not compatible with a shunt pump in the install-
ation; remove the shunt pump and change the installation's ba-
sic diagram accordingly.
Excessive counter-pressure in
the air/flue pipe
▶ If required, protect the product (wind deflector).
F.46
Cold water sensor short circuit
Cold water sensor defective ▶ Replace the cold water sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
F.49
Fault: eBUS
Short circuit in the eBUS con-
nection
▶ Check that the eBUS connection works correctly.
eBUS overload ▶ Check that the eBUS connection works correctly.
Different polarities at the eBUS
connection
▶ Check that the eBUS connection works correctly.
F.61
Fault: Fuel control valve
Short circuit in the cable har-
ness for the gas valve assembly
▶ Check the cable harness for the gas valve assembly.
Gas valve defective ▶ Replace the gas valve.
PCB defective ▶ Replace the PCB.
F.62
Fault: Delayed shutdown of the
fuel control valve
Gas valve defective ▶ Replace the gas valve.
PCB defective ▶ Replace the PCB.
Ignition electrode defective ▶ Replace the ignition electrode.
F.63
Fault: EEPROM
PCB defective ▶ Replace the PCB.
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