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I think all the answers are invisible or the op is not reading them

Pumps should not be fitted in lofts I would only fit those pumps if the customer supplied them then when they leak it is not my problem. I will only provide and fit S & T pumps link above With the amount of problems you've had I would have thought you would want to get it right not penny pinch

Judging by the price you've quoted above I would say you would be the cheapest

The expansion vessel should be fitted above the connection point, all pipe work should rise to the vessel. The vessel should be fitted vertically air gap at the top of the unit, expansion of water can then push upwards against the air. The air pressure needs to be adjusted before fitting they...

+1 The pressure in expansion units should be checked yearly when the boiler is serviced, my guess is it hasn't been serviced and the expansion unit hasn't been checked

Dan told you that on Monday The head height is taken from the base of the cold water tank to the highest point, pipework in loft or the shower head. If you haven't got a 2m head from these points there will not be enough flow through the pump to start it. Why do installers not read instructions.

The op has not stated it was uncontrolled

The expansion vessel needs to be sized for the system how many radiators are fitted to the system When adding an external unit I fit an 18 litre unit space permitting best to over size than under an 8 litre unit is only suitable for approximately 6 to 8 average sized radiators. If you calculate...

What other tests did you do to confirm the diaphragm is split did you drain the combi when you pumped it up what pressure did you pump it to

How did you try to recharge it

Get the electrician back to sort it obviously something not wired correctly

This is the only pump I will supply and fit never had a problem you get what you pay for A pump should not be fitted in the loft it states that in the instructions for the pump that has been fitted http://www.showerdoc.com/stuart-turner-monsoon-universal-2-0-bar-twin-shower-pump

Normally a service will correct this fault min and max gas pressures need to be checked in hot water mode. If this doesn't sort it the gas service engineer will know what parts to replace.

Have you removed the non return valves they will be located in the inlet fittings or in the inlets of the shower valve if you haven't removed them you have got no chance of it working.

Wax diverter valve

I've given you a thanks you can wipe away the tears now lol

The clue was in the first post or didn't you read it

You just need a part replaced then it will be ok but as it is part of the combustion chamber it is not a diy job and the forum rules Prevent us telling you the part you need

When you reset it does it fire and lock out or go straight to lock out

Have you removed the non return valves in the inlets on the shower valve if fitted Have you fitted a negative head or positive head pump This is the pump I would have fitted, would have saved you all the problems you've had...