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Plenty of hot water but no heating Potterton Suprima 50


When the CH only is turned on, there is no heat in the radiators. When CH and HW are on,only the water heats, but it gets way too hot. The radiators are all individually turned on, the pump is on, and everything sounds as if it is running ok. Any suggestions?

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Most likely the radiators need to be bled, there will be a screw at the opposite side of the radiator to the inlet get a small dish and place it under the screw undo the screw a little untill the air escapes and water runs freely from it
if that does not work trace the lines back and see if there are any bleed valves on the lines these may need to be bled as well this can be time consuming

Posted on Jul 14, 2010

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2. During receiver fitting the pcb suffered a static electricity surge. Possible, but unlikely as this sort of damage is usually immediately evident. However, boiler pcb's are notorious for sudden failures anyway and can happen anytime. Combi pcb's are more prone to fail as they usually have up to four solenoids fitted and these do eventually fail due to mechanical wear.

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4. One of the micro switches activated by the diverter valve has failed. Possible, but not likely. The purpose of the switches is usually to fire up the boiler to provide HW when the CH is not currently running, but as you haven't said which Vaillant you have I can't be definitive on this.

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