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    Alpha CB50 no hot water

    No hot water (CH working fine). Boiler doesn't have a flow switch/turbine - as demand for hot water comes from NTC on side of thermal store cylinder. Diode B flashing every 5 seconds (indicating normal boiler standby) i.e. boiler doesn't seem to be registering a demand for HW at all. Changed...
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    Vaillant Aquaplus 362 over-pressurising

    Had a problem with occasionally recurring F22 on this boiler. Changed the AAV, flushed the system but no joy. Now the tenant reports that the boiler is periodically over-pressuring and discharging (every few weeks). Any ideas what's going on with this boiler/system please?
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    Worcester 25Si PRV change

    Am I alone in thinking this is a nightmare job. Need to change the PRV but it's tucked right up the arse of the boiler. Service manual advises to remove the 'hydraulic block'. i.e. pump, diverter valve, plate heat exchanger etc which requires opening no end of connections ... has anyone carried...
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    Main 24 HE overheat

    Hello there Just registered with this site. I am an RGI. Got a problem with a Main 24 HE combi continually shutting down on CH demand (but no problem on HW) and would be very grateful for any help; I'm going to site again tomorrow. Burner is shutting down about 10 seconds after ignition...
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