Appendix
44 Installation and maintenance instructions MicraCom 0020289288_02
Statuscode Meaning
S.32 The waiting period for the fan start-up is activated.
S.34 The frost protection function is activated.
S.39 "Burner off contact" has triggered (e.g. surface-mounted thermostat or condensate pump)
S.41 The system pressure is too high.
S.42 Flue non-return flap return signal blocks burner operation (only in conjunction with the multi-functional
module) or condensate pump defective, heat demand is blocked.
S.46 Comfort protection mode for flame loss at minimum load is activated.
S.53 The product is within the waiting period of the modulation block/operating block function as a result of
low water pressure/water deficiency (flow/return spread too large).
S.54 Waiting period: No water in the system, flow/return sensor temperature increase too high.
S.58 The burner's modulation limit or the function for the siphon filling is activated
S.76 A service message is activated. Check the water pressure.
S.88 The purge programme is active.
S.91 The exhibition mode is activated.
S.96 The self-test for the return temperature sensor is activated. Heat demands are blocked.
S.98 The self-test for the flow/return temperature sensor is activated. Heat demands are blocked.
D Fault codes
Message Possible cause Measure
F.00
Flow temperature sensor inter-
ruption
Plug for flow temperature
sensor loose/not plugged in
▶ Check the plug and the plug connection for the flow temperat-
ure sensor.
Flow temperature sensor de-
fective
▶ Replace the flow temperature sensor.
Multiple plug loose/not plugged
in
▶ Check the multiple plug and plug connection.
Interruption in the cable harness ▶ Check the cable harness.
F.01
Return temperature sensor in-
terruption
Plug for return temperature
sensor loose/not plugged in
▶ Check the plug and the plug connection for the return temper-
ature sensor.
Return temperature sensor de-
fective
▶ Replace the return temperature sensor.
Multiple plug loose/not plugged
in
▶ Check the multiple plug and plug connection.
Interruption in the cable harness ▶ Check the cable harness.
F.10
Flow temperature sensor short
circuit
Flow temperature sensor de-
fective
▶ Replace the flow temperature sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
Flow temperature sensor cable
defective
▶ Check the flow temperature sensor cable.
F.11
Return temperature sensor
short circuit
Return temperature sensor de-
fective
▶ Replace the return temperature sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
Return temperature sensor
cable defective
▶ Check the return temperature sensor cable.
F.13
Cylinder temperature sensor
short circuit
Cylinder temperature sensor
defective
▶ Replace the cylinder temperature sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
Short circuit in the connection
cable
▶ Check the connection cable and, if required, replace it.
F.20
Temperature cut-out safety
shutdown
Flow temperature sensor de-
fective
▶ Replace the flow temperature sensor.
Return temperature sensor de-
fective
▶ Replace the return temperature sensor.
Earth connection faulty ▶ Check the earth connection.
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