It
It was a steady red jock ??
Not in the case of the Trumatic C boilers, which Ian has. They are designed to provide heating, with the integral water tank empty or full.
@ianthebuilder, I hope you manage to get it sorted Ian. Is there a steady red or flashing red light on the heater control, when operated?
Cheers,
Jock.
It was a steady red jock ??