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How to fix low pressure on potterton puma 80 boiler?

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How to fix low pressure on potterton puma 80 boiler?

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How do I get boiler pressure working when low pressure light is showing and boiler has 1 bar of pressure. I have bled radiators and followed previous answer from a thread in 2006 below but still no joy. I had a similar problem. Having bled a radiator the low pressure light came on, and would not go off despite repressurising the system.Despite the pressure guage showing the water pressure at the right level, the pressure sensor light remained on. Solution: I identified the yellow wires that connected the electrical unit to the water pressure sensor. With POWER OFF, pilot and CH on, front and bottom cover removed, and electrical unit hinged forward and down (by undoing retaining screw above) I could get to the pressure sensor behind the electrical unit. I disconnected the sensor (2 yellow wires) and (carefully) put the power on. The boiler fired. I then switched power off, reconnected yellow wires (tried both ways – there being no way to tell which yellow wire going to which connector)

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