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This might be better , blue is from boiler, red is vent, green is feed from tank, purple is bypass and orange is return to boiler

It's currently pipe, boiler, vent, pump, zone valves, rads or hot water tank, then feed is on return to boiler

There is no valve, just the vent pipe into the loft above the f & e tank

Sorry forgot to add, she had boiler serviced before Xmas, boiler man told her to have it power flushed, so she had that done too.

Hello people, some advice required if posible. One of my neighbours has asked me to look at her heating, she had a new boiler fitted about a year ago, and recently had a new pump fitted, now her heating is noisy, gushing noise down vent, and get so much air in system that hardly any rads...