Oil combi boiler - heating but no hot water

[Avocet]

We seem to have run out of hot water.

It's a Worcester Heatslave, oil-fired combi boiler, 25 years old. When I open the hot tap, I can hear the electrical click in the boiler housing as it senses the demand, but the burner doesn't fire up. The central heating side of it works fine though. Any thoughts, please?

 

[oilhead]

First thought would be DHW thermostat. You need a multimeter, and then follow the fault finding chart in the manufacturers instructions. They are simple and comprehensive for this model.

 

[Avocet]

OK, I'll follow that up, any thanks!

 

[Avocet]

Just an update on this one. All was not what it seemed! The problem seems to be linked with my other problem (knocking bath taps). I've since found out that there's hot water aplenty from all te other hot taps in the house and the boiler seems to be working fine. It's almost as if the knocking from the bath tap causes the boiler some confusion and it just shuts down!