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Re heatingsman's post of 17/2, BG has confirmed it has checked these points and they are OK. The manual imples that there is no internal bypass, saying that an external bypass is required if TRVs are on ALL rads, so that the even if all TRVs are closed the min flow rate for the boiler is...

Thank you Heatingman. Will look into the points you raised.

BG replaced the 3 solenoids around gas valve which fixed erratic DHW. Also replaced pressure switch above boiler. BG then said gas valve working correctly, correct voltages measured etc. Regret unable to photo. However boiler looks as you describe but with dark brown large glass drop down door...

Old Chaffoteaux Celtic Plus boiler in house I have moved into. Various problems fixed by BG and boiler working reliably for some time. However have noted CH works fine with all radiators on but if then start turning some off, as soon as only 3 radiators left on, boiler flames go out leaving only...

I have an old combi boiler in small house controlled by old mechanical 2-wire room thermostat. No TRVs. Thinking of upgrading to new stat so see display of temps and possible narrower hysteresis. The above battery-powered Danfoss claims to be compatible with old stats and has display of...

Many thanks for advice. Perhaps I'll just stick to painting and decorating.

There is excellent advice in this forum - would be greatful for any comments on the following. I am retired from the IT industry, having gained a degree in electrical engineering in 1970. I've done simple DIY electrics at home over the years but have no trade qualifications or experience. I'm...