My boiler is approx. 6 years old and covered by BG Homecare, BUT....... after fitting a thermistor sensor, a multi function gas valve and an air pressure switch they have not resolved the problem of constantly fluctuating hot water temperatures from all my taps and 2 Mira showers. BG engineers blamed the showers, but the Mira engineer has replaced the cartridges (though he said they were not faulty) and the problem persists. Regardless of what setting the DHW control is set to, the hot water comes out scalding hot one minute and cool the next. PLEASE HELP !!!!!

Margaret Duke, October 2007

my worcester 28cdi hot water will not ignite without heating being on. have fitted new Diaphragm to diverter valve.is there same thing else i need to change // could i need a new flow switch or a thermister sensor ??

Tony, January 2014

sounds like dirt or scale in the plate heat exchanger. We usually remove them and give them a good flush through with the outside tap. 9/10 times it does the job

bg engineer, October 2007