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Bumping this topic as I am also trying to find a 650mm wide hatch

Forgot to mention that hot water is working perfectly. The boiler is receiving demand from the timer/thermostat, I used the service switch to be certain that this isn't the problem. The overheat has not tripped. Joe

***Grant Vortex Pro external combi 26e*** I drained down my central heating system yesterday so that I could drop some pipes down below the floorboards. Now the heating won't work. Have you got any ideas before I call someone in? So far I have... #Bled all radiators. #Pressed service...

I contacted Honeywell & they came back with this response. Looks like I'll be getting someone in. Dear Sir Presumably there is a programmer/timer of some description. A full electrical check is required to ensure that power is getting to the relay box from the programmer and then determine...

Hello, I have a Honeywell HCW80 room thermostat and HC60NG relay unit connected to a oil combi boiler. All has been working fine until recently. The heating will not start at the required time unless I press the button on the relay unit (occasionally needs to be pressed twice). The boiler...

DHW I think, the green one in the bottom right of the second picture

I do. The problem is that the pump continues for an excessive amount of time once the burner shuts down

bump

By motorised valve, I assume you mean one of these: If so, I don't seem to have one. Pictures of my boiler below: How does a frost stat replace the need for a pump overrun? I thought a pump overrun was used to cool residual heat in the boiler and the frost stat used to prevent...

Thank you. Is there an easy way of testing for this or should I call someone out? I am a very competent DIYer when I have a set of instructions to follow but too much of a wimp to poke around blindly!

The boiler is heating the hot water and central heating fine but there is a problem with the pump over run. It seems to run for a totally random amount of time from about 10 minutes to overnight. I think that the overrun on this boiler is controlled by an electrical timer than a thermostat...