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Help diagnose a fault on an oil combi boiler.
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<blockquote data-quote="ProDave" data-source="post: 238538" data-attributes="member: 6969"><p>Todays estate agent fault to look at. An oil fired combi boiler where the hot water is not working.</p><p></p><p>It's a Camaray 5 Combi 90B external. A make I have not heard of, but looks remarkably similar inside to a Grant, which is a common make of outdoor combi oil boilers.</p><p></p><p>Of course the fault is intermittent and when I was there it worked perfectly.</p><p></p><p>When it goes wrong, they say they get a short burst of hot water, then it goes cold, but if they turn the heating off, then the hot water works.</p><p></p><p>The way this boiler works, is there is a flap type water flow sensor that activates when you start drawing off hot water. That turns off a motorised valve, which shuts off the heating flow and diverts it to the heat exchanger plate for the hot water.</p><p></p><p>Now my thinking is the flow switch is the likely fault. If it were the motorised valve then I would expect the fault to be "no heating" as the motorised valve has to energise to divert the flow to the radiators.</p><p></p><p>Anyone agree or disagree with this diagnosis.</p><p></p><p>As I say it wouldn't go wrong when I was there, so changing the flow sensor seems a simple first step, and at least will rule that out if it doesn't fix the fault.</p></blockquote><p></p>
[QUOTE="ProDave, post: 238538, member: 6969"] Todays estate agent fault to look at. An oil fired combi boiler where the hot water is not working. It's a Camaray 5 Combi 90B external. A make I have not heard of, but looks remarkably similar inside to a Grant, which is a common make of outdoor combi oil boilers. Of course the fault is intermittent and when I was there it worked perfectly. When it goes wrong, they say they get a short burst of hot water, then it goes cold, but if they turn the heating off, then the hot water works. The way this boiler works, is there is a flap type water flow sensor that activates when you start drawing off hot water. That turns off a motorised valve, which shuts off the heating flow and diverts it to the heat exchanger plate for the hot water. Now my thinking is the flow switch is the likely fault. If it were the motorised valve then I would expect the fault to be "no heating" as the motorised valve has to energise to divert the flow to the radiators. Anyone agree or disagree with this diagnosis. As I say it wouldn't go wrong when I was there, so changing the flow sensor seems a simple first step, and at least will rule that out if it doesn't fix the fault. [/QUOTE]
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Help diagnose a fault on an oil combi boiler.
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