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HI is the pump overrun provided ?the pump should stay on for few minutes after the burner has been turned off to take the heat out from boiler. if this does not happen then pump will stop suddenly when the burner is turned off causing excessive heat to be trapped which causes loud noise...

HI depends where you live.how long the job is .

HI sounds like two different faults pressure rising 1.expansion vessel faulty hot water problem common on these boilers hw diaphragm split/damaged

HI sink waste and flush not connected.flushing valve rubber seal worn or an object stuck which prevents complete seal and water over flowing into the pan.

HI i hope you are registered/qualified for this.fit the room stat wires in the same terminals where the link was fitted.

HI need more details,and you might not get any reply/help due to make of the boiler as not many engineers install/repair these boilers. boiler not igniting can be caused by varios things eg,pressure switch fault,hw/ch sensor fault,p.c.b fault and more.

HI common fault on these boilers.diverter valve head becoming jammed.but better to carry out other checks first .

HI keep the shower .retile the gaps.

HI simple solution.the boiler can be fitted with pluming kit (special flue) this will have air inlet in normal place but the outlet can be extended to a safe place away from doors /your window ,etc. FED UP OF COWBOYS ? TRY INDIANS

HI i would think so.although not done solar panels but it is a common sense that the pipes are fitted to the right terminals.

HI can be many things 1.radiators too small 2.house not insulated properly 3.boiler temp low 4.rads too old /crap in the system 5.gas supply low to the boiler 6.plus more

HI hard to think anything else at this time of the year.most likey frozen pipe somewhere.this can also happen inside the house.i have repaired many.

HI need more details of the system .

HI either the handle screws out or there is little screw at the rear ,top of the tap.use small allen key .remove top cap then access to the cartridge.

HI check vaillant website

HI Can be so many things . sensors ,heat exchanger ,,,,

HI can a blown car reverse bulb cause seat belt to get stuck ??

HI buy new one.

HI 1.boiler diaphragm fault 2.shower mixer valve fault(cartridge)

HI sorry to reply after few months but what i meant was JG plastic stop ends that come off easily .other JG fittings are perfect never had any problems. just wanted to make clear.