Hi i've got a problem with my highflow 400 rsf boiler,when i have the ch on the radiator are warming up ok but when i turn hot water tap on hot water come out ok,but when i turn hot water tap off even with CH turned off and room stat off but hw on the radiators start to ge hot. When i turn HW off and pump stops if i put CH on everything is ok again until i turn on hot tap anybody come across this before thanks,Dave.
worcester bosch highflow 400 rsf
- Thread starter welder107257
- Start date
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Diverter fault or NRV in return isolator.
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