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It is not uncommon for my boiler to heat, but for the pump in the boiler to not pump water around my system. The thermostat correctly sends signal to the valves (S-system) and to the boiler. When I have the problem, I’ve found that switching off the boiler for a few seconds, and then switching...

I've recently had a new boiler fitted, a Worcester Bosch 30CDi which the engineer obviously told me was the right size for my property. Since having the new boiler fitted, I've looked more closely at my CH and I'm now wondering if the boiler is too big. The money difference between a bigger and...

I've got a Y-plan system. My room thermostat can call for CH ON or HW ON or obviously both ON at the same time. But it can't call for HW OFF (other than the absence of HW ON). Which means that the mid position valve would always be in either the mid-position or CH only position. With the room...

I've got a BGMVSP-23 actuator on a Y-plan system. I recently replaced the old mechanical room thermostat with a new digital one that combines the time programmer and thermostat in one unit. When I couldn't seem to get the new unit to get the boiler and actuator to do the right thing I started...