I have a Baxi Bahama 100 combi boiler with the Honeywell controls and a remote programmable roomstat which was installed in March 2000 and has been very reliable requiring the ususal flowswitches (4 HW & 2 CH), diverter valve cartridge (spindle leak), air psw (microswitch mounting) and the annual inspection/drain/flush etc; however recently with the selector switch set to HW/CH the boiler frequently trips on overheat and during the recent warmer months I set the selector to HW only but it still persistently trips on overheat e.g. soon after starting to fill the sink for washing up.
I have replaced the control thermistor, overheat thermostat and control pcb but I am now unsure if the cause is likely to be the control pcb, diverter valve, pump or some other problem and I realise that at 11 years old the spares situation could be a problem, but it is in very good nick and I am not really in a financial position to replace it. I am an engineer competent with multimeter etc. and any further tests or advice will be very gratefully received.
R
I have replaced the control thermistor, overheat thermostat and control pcb but I am now unsure if the cause is likely to be the control pcb, diverter valve, pump or some other problem and I realise that at 11 years old the spares situation could be a problem, but it is in very good nick and I am not really in a financial position to replace it. I am an engineer competent with multimeter etc. and any further tests or advice will be very gratefully received.
R