IS339 ECN3539
11
DIAGNOSTIC MESSAGES
The control panel displays messages and information that can help with fault
diagnosis.
Before calling for service, draw off a litre of water, clear the fault code by
pressing the Fn button and turn the boiler off and on again at the mains
supply. If the fault persists call service for advice.
Message Displayed Possible cause Corrective action
• Scale on level sensors
• Boiler overfilling
• Descale.
• Check water inlet
valve
• Water turned off
• Inlet hose bent or blocked
• Water pressure too high
or low
• Drain valve open
• Check water
supply and drain
valve.
• Call service if fault
persists
• Boil-dry / overheat
protector tripped
• Temperature sensor fault
• Element failed
• PCB fault
• Faulty / loose connection
• Check
connections.
• Call service if fault
persists
• Temperature set too high
• Temperature sensor fault
• Boiler not filling
• Excessive scale in tank
• PCB fault
• Reduce
temperature
setting and try
again.
• Call service if fault
persists
• Temperature sensor fault • Call service
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