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Ok, an update. Up early this morning as the house was cold! I have the system running - set d.0 to 6kw to give the boiler a chance to run steady state and put the pump on max, with just a couple of rads open and it ran continuously. I've opened all rads up and all are heating up, although slowly...

Yep, it is. And to be sure, I took the motor off and turned it manually.

Expansion pipe and cold feed are in the roof space. Pump valves are in the airing cupboard ground floor - no changes to any rad valves. The only things I’ve done are drain , refill , bleed, and add the magnetic filter ( yes , valves are open on that). Apart from that it’s identical to how it was...

Hello All, Bear with me please while I explain my issue. In the meantime I have been trawling this forum to seek answers to my issues and am well aware that the Vaillant 428 has problems. We have the Vaillant 428 EcoTec plus installed for about 15 years. Its an extended bungalow (we have an...

I'm sure its on its way. I'll check anyhow. Thanks for the info.

No - fully legit and he did a nice tidy job..... I just found what you are talking about - the comissioning checklist (the benchmark bit was hidden under the gas analysis ticket).

Tony Thanks - I thought it would be a matter of just taking a little longer to warm up if I had it too low. It seems pretty good on the setting I have now - a nice gradual rise up to the set temp and stays there until the room stat stops calling for heat. I'm not sure what a benchmark...

Hi First post but I have read a bit before doing so. I've just had a 428 installed to replace an aeging Potterton in an open vent system. I understand the need to range rate the boiler. I have 13 rads and a megaflow for HW in a challet bungalow - reasonably well insulated. Most of the...