Central heating mode Possible Causes
S.00 no heating required
S.01 fan pre-run
S.02 pump pre-run
S.03 ignition
S.04 burner on
S.05 pump / fan overrun
S.06 fan overrun
S.07 pump overrun
S.08 Anti cycling period
Check flow & return thermistor connections to pipes.
Check harness connection to thermistor.
Check harness wires are not trapped between any
internal components.
Check flow & return thermistor connections to pipes.
Check harness connection to thermistor.
Check harness wires are not trapped between any
internal components.
Check flow & return thermistor connections to pipes.
Check harness connection to thermistor.
Check harness wires are not trapped between any
internal components.
Special cases of status messages
S.30 No Heating demand from external controls 230V Check wiring in external controller.
Check wiring at Installer Interface.
S.31 summer mode Check CH setpoint / Check external controls
S.32 Antifreeze active – fan speed variation too high Check fan connection.
– waiting during blocking function
S.34 frost protection active (Priority 4) Temperature below 8
O
C - check thermistor
connection if this is not true.
S.36 No Heating demand from external controls 24V Check wiring in external controller.
Check wiring at Installer Interface.
S.42 Accessory Module is blocking burner operation Check accessory module.
S.53 waiting time: temperature difference flow
- return sensor too high (Check thermistor fit)
S.54
waiting time: no water in system, temperature
(gradient error) rise flow / return sensor too high
S.76
Waiting period – pressure sensor Check system pressure - default display.
S.96 Return-Sensor check is running, demand Check return thermistor connection to pipe.
(DHW or heating) is blocked Check harness connection to thermistor.
S.97 Water pressure sensor check is running, Check connection to pressure sensor.
demand (DHW or heating) is blocked Check pump has not seized.
S.98
Flow / Return - sensor check is running, demand
(DHW or heating) is blocked
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