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Dripping Tap?

Purmo, Barlo Compact.

Bought myself a £99 Toolstation breaker, and broke up 110m2 of 200mm concrete in my front garden. Took me 3 days. Yours may take the same amount of time as you would have to barrow the rubble to a skip.

The RT500RF have dipswitches in the receiver and transmitter, sometimes by changing the dipswitch settings and rebinding the units they will work. You need to download the instructions.

Could be an airlock, with the pipes connected that way.

Should be a non return valve on the Hot Water Secondary Circulation circuit.

https://www.diynot.com/diy/threads/diy-gas.8090/

Greenstar Cdi Boilers like your should easily last 20 years.

Doesn't the boiler show a no flow fault code, or overheat code.

System boiler has a tiny bypass, just to allow enough flow through the heat exchanger. I normally fit an additional autobypass before any 2 port zone valves anyway.

System Boiler or Conventional Boiler System boiler has pump and bypass built in. Conventional Boiler - Separate Pump and Separate Auto Bypass required.

Ian, The boiler was fitted a couple of years ago, so it's either a Junior, I, SI, cdi (if combi) or RI (Heat Only) I (System). All will work with a wireless programmable stat (for the heating only), unless I've forgotten of a WB Boiler manufactured in the last 5 years that doesn't.:p

Wireless Programmable Room Thermostat.

Are you asking why your central heating isn't working? Programmer? Roomstat?

Filling Loop is on the RHS, so where is the leak coming from.

Is it pipework creaking. When you bleed the radiators do you get air or water out of the air vent.

Got to ask, how did the installer commission the boiler properly if it kept going to E43 on hot water. What does the benchmark commissioning page say.Something doesn't ,make sense here. Particular the visit by the Alpha Tech and no paperwork.

Can't see for squiggly blue lines. Are there 2 pipes or just 1 pipe that loops back on itself.

Repipe it from underneath, with a couple of street elbows, and you can pack it out 10/15mm.