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Mend Ideal Response 120 Heating Noise Thermostat

How can I fix my Ideal Response 120?

The noise only happens on heating only, when the boiler thermo stat reaches temperature, the noise is a loud droning noise and the boiler shudders.

Alfred
April 2008
Could be a partial blockage in the heatexchanger, may need replacing, if the water in your system is black/ish the whole system may need cleaning & flushing also, if you replace the heatexchanger and not clean the system it will fail twice as quick as the first!

T
April 2008

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