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Has this been a problem from the beginning?

Does the hot water demand light come on when you open a tap? Try operating the microswitch with you finger.

Why?? Balderdash indeed!

Nothing wrong with gate valves. Did you install any manual air vents at the high points to prime the system?

Well there you go. I've not been to one in a while. I was never a fan of this obsession to make boilers smaller and smaller. Particularly combis, take note Ideal. When they brought out the Suprima 120, I thought miniaturisation was getting out of hand.

Most of the advice regarding PRV and expansion vessel has been good. However, I came across one a couple of months ago where the pressure was still rising even with the filling loop disconnected. The culprit was a tiny perforation in the DHW heat exchanger allowing secondary water to mix with...

The first 2 incarnations of the pcb were troublesome. The bbc watchdog website used to have and maybe still has a downloadable letter to enable people to get refunds from the manufacturer. The latest version of the pcb came with new wiring looms and so far has been ok. My advice would be to...

If you are on a Honeywell Y plan and the boiler fires ok for HW, easiest way to test is to select heating to come on, turn up the room stat and if you have 240v on the white wire on the mid position valve, the valve is faulty and you can change the valve or just the syncron motor inside. If you...

Your lack of knowledge is embarrasing. Pump manufacturers usually ask for a minimum 50 gallons cold water storage. Irrespective of cylinder size, when the tank empties the pump will run dry, even though the cylinder remains full. A Fortic or combination cylinder will certainly not entertain a...

No mate, it uses flame rectification back down the ign electrode and lead.