My shower always used to give constant hot water. The sink taps still give endless amounts of hot water but the boiler cuts out after 20-30 secs when i switch the shower on.

Any ideas where the fault may be?
It's a Gainsbrough Ambassador if that helps.

Franzipan, July 2008

You do not give sufficient information! Is the shower Electrically heated mains water, or tank and cylinder supplied. Do you have a "Combi" boiler. If you contact the manufacturer's customer helpline and describe the symptoms , they will be able to help. Off the cuff; it sounds like a thermostat problem.

Joseph McGinn, July 2008