Highflow 3.5 BF Boiler, has worked brilliantly all its life. Now on last legs.
With central heating on, the boiler shuts down after about 20 minutes, but with just hot water, it works perfectly well.
The heating control thermostat seems only to click near its low point. Even with low heat setting, the boiler shuts down after about 20 minutes. Then I have to re-light the pilot flame.
Anyone out there with some explanations as to what is causing this problem?
With central heating on, the boiler shuts down after about 20 minutes, but with just hot water, it works perfectly well.
The heating control thermostat seems only to click near its low point. Even with low heat setting, the boiler shuts down after about 20 minutes. Then I have to re-light the pilot flame.
Anyone out there with some explanations as to what is causing this problem?
