Rotex GasSolarUnit Series User Manual

[ 54 ]
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

Rotex GasSolarUnit Series Specifications

General

Brand	Rotex
Model	GasSolarUnit Series
Category	Boiler
Language	English