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Ok went back to the church Friday afternoon to see if I could fix it before their Sunday service. And I finally resolved the issue. I checked the pump torque (as suggested) and that seemed no different to another 15-50 pump head I had. I swapped them just be be on the safe side and no...

I went back today and removed the flexi pipes to and from the heat exchanger as you guys suggested. They did not appear to be too blocked. I have a small endoscope which I put through both pipes and could see no blockage. However the walls of the pipes were scaled. I flexed the pipes and could...

To dp the power flusher was connected via two 22 mm stubs in the flow return about 400 mm below the boiler and under the magnetic filter and fill point. The downstream flow and return is isolated with butterfly valves just below that. This insured that the pf is only blasting through the...

To cbw Yes I agree. But before I strip the pump down I wanted to ask the op what his solution was in case he could save me unwanted effort. The flow pressure differential implies no blockage of substance so the pump or the bypass is the logical place to go next but he might have a completely...

To cbw Yes valves open. My power flusher can push water through the boiler from flow to return or return to flow as if it was an open 15 mm pipe, hardly any pressure difference between the two implying no flow restriction, blockage or similar flow inhibited. When I shorted flow to return it was...

To Bellairaphon did you ever resolve the vokera compact 28 problem. I have a customer (a church) with the same situation. Boiler ignites, pump is circulating water, I feel heat build up on the flow, and then the boiler shuts off flame due to excessive heat. It takes a good 8 seconds or so for...