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Worcester Daneismoor HHSC 190SO oil fired combi boiler.
When the central heating is on, turning on a hot tap just gives cold water.
Turn the central heating off, hot water works fine.
The plumber has been and replaced the flow switch, the 3 port valve inside the boiler and the thermostat. and given up.
Before I go any ideas? Anyone know this boiler?
When the central heating is on, turning on a hot tap just gives cold water.
Turn the central heating off, hot water works fine.
The plumber has been and replaced the flow switch, the 3 port valve inside the boiler and the thermostat. and given up.
Before I go any ideas? Anyone know this boiler?