Central heating mode (Priority 3) Description
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.
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 Fan speed variation too high Check fan connection.
ā 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.42 Accesory 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 ā 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.98 Flow/Return-Sensor check is running, Check flow & return thermistor connections to pipes.
demand (dhw or heating) is blocked Check harness connection to thermistor.
Check harness wires are not trapped between
any internal components.
NORMAL OPERATING
STATE FOR CENTRAL HEATING
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