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Ok, I will adjust the setting, thank you for that useful information. TBH the installer messed up a few things so no huge surprise if the configuration wasn't right. It is not set to PP2 btw, it looks like PP1 from the diagram, green space space yellow. Really appreciate you looking at this.

The heating was on for one hour before the water came out. There are 14 rads and it's a fairly big place so that feels to me like it would be down to the water level being too high and the expansion reaching a critical point and driving the level above the overflow. But just guessing until I...

My job for tomorrow is to go into the loft and investigate the depth. I wondered if I could have somehow knocked the ballcock when putting in the bung but there's no constant drip, just a spurt when the heating comes on. I will check and lower the level if it's too high. I've just put the...

Grundfos UPS3 15-50/65. Three LEDs, when firing the I is green, II and III are amber.

Thanks for the response! Oil boiler, Worcester Bosch, 4 years old, regularly serviced. Last serviced end of January. Internal circulation pump located in the airing cupboard, also changed 4 years ago. No adjustments made to anything else, other than changing the valves and draining/refilling...

Hi there, I had to remove and drain a towel radiator a few weeks ago as both valves were leaking and needed replacing. I bunged the system rather than draining it because it's a big house and the refill process takes hours. The water that drained from the radiator contained some black sludge...