Hi all,
I'm having a bit of trouble with my boiler, a Worcester 28i RSF.
The hot water has been intermittently running really hot (up to 85degC) and tripping out the overheat thermostat (requiring the reset button to be pressed on the top of the boiler).
This happens a up to 5 times a day at the moment. It's difficult to tell the exact actions that result in the trip, but it seems to be mostly when a tap is running (very) hot water and then the hot water demand is reduced by either turning the hot water tap down/off, or adjusting a mixer tap to cool the flow.
There is no temperature control on the 28i so nothing to adjust, I believe the maximum output temp for the unit is set at 55degC.
There is a good strong flow and I haven't noticed any drop off since the issue started occurring.
I have replaced the DHW thermistor with no effect.
I called out a plumber who didn't know what the issue was, but after a few calls to the Worcester helpline he suggested that the PCB probably needed changing, but can't say I was overly convinced.
The other thing I thought may be the issue is the flow turbine.
Before I have a go at changing either of these parts, is there anything else I could check?
And if not, which do you think is the most likely culprit out of the flow turbine and the PCB?
Many thanks,
Andy
I'm having a bit of trouble with my boiler, a Worcester 28i RSF.
The hot water has been intermittently running really hot (up to 85degC) and tripping out the overheat thermostat (requiring the reset button to be pressed on the top of the boiler).
This happens a up to 5 times a day at the moment. It's difficult to tell the exact actions that result in the trip, but it seems to be mostly when a tap is running (very) hot water and then the hot water demand is reduced by either turning the hot water tap down/off, or adjusting a mixer tap to cool the flow.
There is no temperature control on the 28i so nothing to adjust, I believe the maximum output temp for the unit is set at 55degC.
There is a good strong flow and I haven't noticed any drop off since the issue started occurring.
I have replaced the DHW thermistor with no effect.
I called out a plumber who didn't know what the issue was, but after a few calls to the Worcester helpline he suggested that the PCB probably needed changing, but can't say I was overly convinced.
The other thing I thought may be the issue is the flow turbine.
Before I have a go at changing either of these parts, is there anything else I could check?
And if not, which do you think is the most likely culprit out of the flow turbine and the PCB?
Many thanks,
Andy