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Fault
Possible Cause
Possible remedy
Heating system not operational
Power supply interrupted
Switch ON the mains electrical isolator - no display
Switch ON the mains electrical
Check/replace control unit fuse
Check/switch ON the domestic supply circuit breaker
isolator of the installation room
The heating system fails to heat up
The central heating standby is switched OFF -
check the position of the ON/OFF switch, time program
etc, incorrect controller setting
Check the demand parameters (see operating
instructions “ROTEX control unit”)
The heating system fails to heat
The heating curve is too low
Increase the parameter (see operating instructions
up sufficiently
“ROTEX control unit”)
The DHW fails to heat up
The DHW heating standby is switched OFF
Check the setting of the operating mode selector, time
program or the demand parameters (see operating
instructions “ROTEX control unit”)
The DHW fails to heat up sufficiently
The cylinder heating temperature is too low
Increase the set DHW temperature (see the abridged
operating instructions or the operating instructions
“ROTEX control unit”)
Excessive draw-off rate
Reduce the draw-off rate; limit the flow rate
The burner output is too low
see fault: the max. burner output is too low
The burner fan does not start in spite of
no burner fan power supply
audibly click the 3-pole fan plug in burner demand
Check the voltage at terminals L-N on the 3-pole plug;
audibly click the 5-PIN fan plug in
The control unit plug-in connections are
Check the correct plug seating in the control panel a
re loose and at the burner control unit
Push the plug fully in
Fan motor faulty (bearing seized)
Replace the burner fan
no ignition
Ignition electrodes short circuited
adjust or replace
Ignition electrodes are too far apart
Adjust
Ignition electrodes are contaminated
and/or damp
Clean
Ignition electrodes burned out
Replace
Insulation body cracked
Replace ignition electrode
Ignition cable burned out
1. Replace the cable
2. Identify and remove the cause
Burner control unit faulty
Replace
Burner does not start in spite of
No burner power supply, cable faulty
Check cable for damage and the correct seating
of the plug burner demand
or plug is incorrectly inserted
in the control panel and at the burner control unit
Push the plug fully in
The flame monitor switches the burner OFF
Check the position of the ionisation electrode,
ionisation cable
(damage, seating)
No gas pressure
Check the gas connection
Air in the gas supply line
Vent the gas supply pipe
The gas valve fails to open
Check the plug-in connection between the burner
control unit and the gas valve, poss. re-align the
connecting pins check the gas valve (vacuum at the
output pressure test port during purging, zero pressure
during ignition)
- possibly replace,
- otherwise replace the burner control unit
No ignition
Check ignition cable plug-in connectors
Check the position of the ignition electrodes
Loud operating noise
Burner incorrectly adjusted
Check and correct the burner adjustment
Bearing damage - burner fan
Reduce the maximum output
- possibly replace
The max. burner output is too low
Incorrect parameter setting
Adjust the output parameter
(see operating instructions “ROTEX control unit“:
Burner control unit parameter level)
Excessive air/flue gas pressure drop
Check lines for contamination
poss. use larger cross-section for ventilation air
pipe and/ or flue
Table 7.2: Fault removal
Содержание GasCompactUnit Series
Страница 17: ... 17 Fig 3 4 3 Flue gas system sets ...
Страница 55: ... 55 ...
Страница 58: ... 58 Fig 8 1 Residual head GSU 25 GCU 25 heating side Fig 8 2 Residual head GSU 35 GCU 35 heating side ...