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yeah, got correct voltage to gas valve, checked resistance through boiler stat - that too seemed ok. home owner has had a vokera service agent out since who replaced the pcb - apparently the problem hasnt gone away. hot water still too hot even with stat down etc etc. yeah the problem...

had a gas valve that wouldnt modulate between min and max burner pressures. if i set it to either, it stayed there regardless of demand or number of wires attached. changed valve - problem stayed same. check wires for continuity etc, everything ok. rang vokera - they said it HAD to be the gas...