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Overheat thermostat?

My overheat thermostat on my Potteron Netaheat Profile 80e keeps popping out.

I have changed the pump and I have cleaned the system out with Fernox descaler and then neutralised it but the thermostat keeps popping. Some days it will not happen, other days it happens 10 times per day

Len
December 2008

Potterton Potterton Netaheat Profile 80e Heating, Home Heating Systems Thermostat Heating System Potterton

Yes the boiler is noisier than before. The main water temperature thermostat seems to work as it clicks the boiler off when turned down

Len
December 2008

Does the boiler make a lot of noise when heating up? If so the main boiler thermostat may be faulty. If the boiler is quiet in operation it may be a faulty overheat stat.

Aarovic
December 2008

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Potterton Netaheat 80e Overheat Thermostat Issue