Can anyone help? I've got a Potterton Performa 28i with a Hot water problem. The boiler switches to DHW fine, all lights correct and no faults indicated. The boiler fires and indicated temp rises to 80 degrees but the water remains lukewarm unless you turn the flow down to a trickle - (I’d guess 1-2 litres per minute). Once 80 degrees is hit the boiler shuts off and then cycles like this until the hot tap is turned off.
Notes. Heating works fine. There is no pass by from the Diverter Valve assembly. This was replaced in 2020 along with the actuator motor. The plate heat exchanger is new (I thought that this was the problem - but no change). New auto bleed valve on pump. I've isolated both the thermostatic shower valves in the house to ensure they're not sending cold back to the boiler. I haven't checked the thermistor yet? I was convinced it was the plate heat exchanger!
Any advice would be greatly appreciated!
Notes. Heating works fine. There is no pass by from the Diverter Valve assembly. This was replaced in 2020 along with the actuator motor. The plate heat exchanger is new (I thought that this was the problem - but no change). New auto bleed valve on pump. I've isolated both the thermostatic shower valves in the house to ensure they're not sending cold back to the boiler. I haven't checked the thermistor yet? I was convinced it was the plate heat exchanger!
Any advice would be greatly appreciated!