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OPTIMA 701 Ferrori heating problem?

Everything is fine but not heating system.
My thermostat is on +17.5C, in room was +15.5C
Boiler switched on at 7am and heathing was for 5 min, then stopped and for next 30min- only pressure system was working, after 30min heating system switch on again for 1min ,and again only pressure system was working.
Sometimes I can hear when heating is on sound as like something wants to switch it off
In 1 hour temperature raised only 0.5C and radiators were almost cold
Do anyone got any idea what should I do?

Michael
November 2009

Optima Heating, Home Heating Systems Heating System Room

quite likely to be the central heating thermistor in the boiler , you can check this by removing the plug on connector from the sensor and swapping this with the hot water sensor, if this works you need a new thermistor, make sure you put the connectors back on the correct sensors after test.....

Brucey
November 2009

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