I have had the gas repair man in twice he has put a new flow switch in, but still the water goes cold, but it has not done it while he was here it seems to be when i have the heating on, the boiler is not fireing up for the water, can someone please help.
It could be several things such as the diverter valve, central heating thermostat, flow sensor or temp sensor. For a step by step troubleshooting guide, check out my source.
