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Right, bit of a strange one. I have a valiant eco tec 618 system boiler in the garage. 2 zones, plus hot water Last week when it was very cold I noticed that when I turned heating on the boiler was not firing up enough to heat the system (flame bar roughly at 25%) - this only happened when the...

Flow is set to 75 degrees

It is a system boiler. Have 2 zones for the heating with motorised valve for each zone. Both zones have the same issue. Only way I can seem to get it to fire up is turn the pipe stat down to the lowest setting, leave it for 30 mins to cool and then turn heating on again.

currently having issue when turning my heating on. When turning the heating on the boiler does not fire up properly/fully so heating and water do not get hot. This seems to happen when the anti frost / pipe stat have already been running. Any ideas what the issue could be? When calling for...

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I’m having a sporadic issue with my boiler and can’t seem to work out what’s going wrong. This happens when it’s cold like at the moment. Turn heating on and boiler doesn’t fire up fully meaning rads only get warm and not hot and house doesn’t warm up. This seems to happen when the frost...

Thanks to everyone for their advice and support. I took a look and indeed it was wired incorrectly - have now changed it and it seems to be working as it should

Thanks I will check. When the frost protection kicks in, only the towel heaters heat up (this is the same if only the hot water system is running). None of the radiators come on with the frost protection. We have a two zone system, plus a separate control for the hot water.

Thanks that sounds right from my limited knowledge, what is the easiest fix for this? Is it something I could DIY or safer to get someone out?

That’s the model, haven’t got a picture of the wiring at the moment, but back to front wiring could make sense as it’s working in reverse to what it should

When I went out earlier, I moved that pipestat from 10 to 25, it clicked and boiler went off. Later on noticed boiler was running for ages again, this time moved pipestat from 25 to 30 and again it clicked and turned the boiler off.

Hi, hoping someone can help me me make sense of this: We have the Honeywell frost protection kit connected to our boiler in the garage. I noticed that when the frost stat kicked in, the boiler was just staying on. Went out to look, frost stat was set to 5 and the pipe state set to 10, when I...