6 x Faults and malfunctions
31
BA ROTEX GSU - 09/2007
Tab. 6-1 Possible faults on the ROTEX GSU
Hot water does not heat
up enough
Storage tank charging temperature too low
• Raise hot water target temperature
Draw-off rate too high
• Reduce the draw-off rate, limit throughput
Burner output too low
• See failure "Max. burner output too low"
Burner does not start Interlocking failure
• Establish cause of failure and eliminate it
• Release the interlocking by briefly pressing the manual button
(max. 5 times per hour)
Burner fan not running
despite burner demand
No mains voltage on burner fan
• Insert the 3-pin plug on the fan until it clicks in place
• Insert the 5-pin plug on the fan until it clicks in place
• Check the voltage at the terminals of the plug
• Check the plug in the control panel and on the automatic firing
unit and insert it correctly
Fan motor faulty
• Replace burner fan
No ignition Ignition electrodes dirty, faulty or incorrectly set
• Clean ignition electrodes
• Set ignition electrodes
• Replace burnt out or ignition electrodes which cannot be
adjusted
• Replace ignition electrodes which have faulty insulation
Ignition cable burnt
• 1. Establish cause and eliminate it
• 2. Replace ignition cable
Automatic firing unit faulty
•Replace automatic firing unit
Burner fan not starting
despite burner demand
No mains voltage on burner
• Check the plug in the control panel and on the automatic firing
unit and insert it correctly
• Replace cables
Flame monitoring switches off
• Adjust ionisation electrode
• Clean the oxidised electrode surfaces of the ionisation electrode
(with fine emery paper)
• Replace worn ionisation electrodes
No gas pressure
• Check gas connection
Air in the gas line
• Vent gas line
Gas valve not opening
• Check plug connection between gas valve and automatic firing
unit and insert correctly
• Realign connecting pins of the plug connection
• Check gas valve (vacuum at outlet pressure measuring socket
during pre-ventilation, zero pressure during the ignition)
• Replace gas valve
•Replace automatic firing unit
No ignition
• See "No ignition" failure
Loud operating noises Wrong burner setting
• Correct the burner setting
Bearing damage on burner fan
• Reduce maximum output
• Replace burner fan
Maximum burner output
too low
Incorrect setting parameters
• Adjust output parameters
Air/flue gas resistance too high
• Check ducts for dirt.
• Use ducts with larger cross section for supply air or flue gas if
necessary
Malfunction Possible cause Possible solution
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