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DHW = Domestic Hot Water

Bet it is an Ideal logic.

Existing: Danfoss 4 - the input of existing thermostat - the output of existing thermostat - white wire of the three port valve. New one: Hive 3 to the white wire of the three port valve. Old the input and output of existing thermostat at the junction to T1 and T2.

Nest live 2 and 5 Heating call, Nest 3 & Danfoss 4 Hot water call, Nest 6 & Danfoss 3 Hot water satisfied, Nest 4 & Danfoss 1.

OP, what is your boiler make and model?

If you have main power already to the programmer then you need buy a new programmer. But how do you know if there is a 230v power to the programmer? You can’t use your eyes obviously, and you can’t use your hands to touch electrical to see if it is live. So you need an electrical tester at least.

It is a Danfoss FP715si programmer, still available from Screwfix. But check you have a 230v power to the programmer.

Your problem is intermittent, and you also have a part throwing gas man. Call an Ideal fixed price repair you will likely get it sorted.

From the error code I can see it is a Logic or its equivalent not an Icos. The L2 or F2 means ignition or frame failure, need to check a few things, so you need a boiler repair man, or call Ideal fixed price repair. As it is intermittent, so better to wait for it to become persistent.

So far you haven't mentioned boiler model. Is it an Ideal Logic heat only? What is the error code then?

A part thrower!

lol.

Which 80. Format 80 or Super 80?

Hose to expansion vessel is blocked.

Hi @picasso , I work for Corig HomePlan sometimes. For an ecoTEC 630 system boiler I had a job which I suspected main hex is leaking only when boiler is running so hot. Corgi called Vaillant fixed price repair, they came out on this Monday, said it is the hex, and they will replace it.

I will let you know in next week.

Hi @picasso , one case in last week, a Vaillant ecoTEC MK1 system boiler installed in a loft space, it need top up on a daily basis. I made total three visits, ie, isolated the boiler from the rest, of course the system wasn't running, surprised me there were no leaking on both sides. So...

Jesus, had to search "back end rot" in the CC to understand it.

Is this one?

It is safe. The default setting is 6 cycles per hour, will give you bit more accurate room temperature control over 3 cycles per hour, I don't see any point on reducing your boiler over all run time.