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sounds to me as if you may have a blocked cold feed... Powerflush of the system should sort ths out, just make sure you link the cold feed & open vent while you are flushing.....

This is a fault which is affects the electrics of the potterton suprima.... the manufacturers now issue the replacement p.c.b with an adapted wiring loom, harness & control panel. you should be expected to pay 165 for the part and 2 hours labour........ i would not recommend re-soldering...