Can anyone help with a frustrating problem?
A few weeks after new boiler/time controller fitted September 2004 - Gloworm 40FF - had problem with HW not heated; that program warmed rads only. Plumber came back, diagnosed old mid position valve as faulty and replaced it. He had difficulty with electrics and notably advised that their sparky had wired old one in incorrectly.
Everything OK again for a few weeks, until problem in question - namely one very loud bang from the (new) valve (and pipe feeding it from boiler) only when HW program ran - not CH (although HW program still heats HW cylinder OK). Many calls to company that fitted it (and Trading Standards) later, they diagnosed that new valve was faulty and eventually replaced it 1/4/05.
Everything OK until this weekend - woken up at 5:30 a.m. when HW program started, by sound like a gun going off I can't believe it - checked next day and same fault has developed again!! I am wondering if any problem with wiring at controller end of circuit? I listened to valve (from cold when boiler off a few hours). When HW program starts, I could hear spring in it move, but not until pump started. Once spring reached position it banged. On CH program I can hear spring move but the pump doesn't start until its finished. Is this correct or should there be delay in the pump switching on for both programs? The sparky that originally wired this when the boiler was fitted (who was supposed to arrive at lunchtime) couldn't be ar**d to arrive until 5:00 p.m and the engineers didn't check what he was doing, because they were just leaving It seems very unlikely that two new valves have both failed.
Can anyone help with advice pleeeeaaase? I think the valve is a Honeywell V4073 and system is Y plan open vented. I have checked both loft tanks have water in and tried turning boiler output down a bit, without effect. It seems strange it's happened same time of year, could the coldness of water in feed pipe from boiler be making it bang when it's first heated?
Thanks guys.
A few weeks after new boiler/time controller fitted September 2004 - Gloworm 40FF - had problem with HW not heated; that program warmed rads only. Plumber came back, diagnosed old mid position valve as faulty and replaced it. He had difficulty with electrics and notably advised that their sparky had wired old one in incorrectly.
Everything OK again for a few weeks, until problem in question - namely one very loud bang from the (new) valve (and pipe feeding it from boiler) only when HW program ran - not CH (although HW program still heats HW cylinder OK). Many calls to company that fitted it (and Trading Standards) later, they diagnosed that new valve was faulty and eventually replaced it 1/4/05.
Everything OK until this weekend - woken up at 5:30 a.m. when HW program started, by sound like a gun going off I can't believe it - checked next day and same fault has developed again!! I am wondering if any problem with wiring at controller end of circuit? I listened to valve (from cold when boiler off a few hours). When HW program starts, I could hear spring in it move, but not until pump started. Once spring reached position it banged. On CH program I can hear spring move but the pump doesn't start until its finished. Is this correct or should there be delay in the pump switching on for both programs? The sparky that originally wired this when the boiler was fitted (who was supposed to arrive at lunchtime) couldn't be ar**d to arrive until 5:00 p.m and the engineers didn't check what he was doing, because they were just leaving It seems very unlikely that two new valves have both failed.
Can anyone help with advice pleeeeaaase? I think the valve is a Honeywell V4073 and system is Y plan open vented. I have checked both loft tanks have water in and tried turning boiler output down a bit, without effect. It seems strange it's happened same time of year, could the coldness of water in feed pipe from boiler be making it bang when it's first heated?
Thanks guys.