F205P
If an operating interruption cannot be resolved with the help of the above measures, you should
request a service call.
If necessary, set the switch to position ”3”.
• Large quantity of hot water drawn off.
• Group or main fuse tripped.
• Earth-leakage circuit-breaker (if present) tripped.
• Switch in incorrect operating mode (D).
• Temperature limiter tripped. Contact your installation
engineer.
• Filling valve to the water heater closed or throttled.
• Incorrect set value on clock thermostat.
• Air filter blocked (replace if necessary).
• Exhaust air terminal device closed, excessively throt-
tled or blocked.
• Group or main fuse tripped.
• Earth-leakage circuit-breaker (if present) tripped.
• Group or main fuse tripped.
• Earth-leakage circuit-breaker (if present) tripped.
• Temperature limiter tripped. Contact your installation
engineer.
• Incorrect set value on clock thermostat.
• Circulation pump stopped. Contact your installation
engineer.
• Air in the boiler or the system.
• Closed filling valves in the radiator circuit.
• Preliminary pressure in the expansion vessel too low.
Contact your installation engineer.
In the event of an incorrect function or operating interruption, the following points can be
checked as a first step:
Dealing with malfunctions
Dealing with malfunctions
Low temperature or no hot water High room temperature
Low or no ventilation
Low room temperature
If the fan becomes noisy, it may require cleaning. Contact
your installation engineer.
Cleaning the fan
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