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How To Check a Diverter Motor Without a Multimeter
Posted by: viva training on: 5 April 2022
In this video Viva Training’s Roy Fugler shows you how to check the diverter motor on a boiler without using a multimeter.
WARNING – This video is for trained, Gas Safe Register Engineers only, never attempt to work on a boiler without the proper qualifications.
Welcome back to the Viva Training Centre in Halifax and today we’re going to carry on with another video in our how-to series what we’re going to be looking at today is how to check a diverter motor without using a multimeter we’re going to be doing it on this Potterton assure boiler and for which is the same as the Baxi 800, 600, Baxi Assure and the Main Eco Compact but the diverter motor in this boiler is the same that’s used on a lot of boilers out there like Vokera, Ideal, Glow Worm and Baxi have all used it in their ranges.
Take the front off the boiler I’ve already removed the two screws off so I’m just going to pop that out out the way.
The scenario is Mrs Miggins has complained that she’s got heating but no hot water or she’s got hot water but no heating. The first thing to establish is does the boiler know that there’s hot water or a heat in demand.
I am using the Eph Combi Pack 4 which is a wireless control. Put the heating on to manual, once the signal goes from the control it should action the boiler and on the display a radiator symbol which is flashing. This means that the boiler knows that there is a heat demand.
Next thing is to turn the the hot tap on and now the tap symbol is flashing. We now know that we’ve got a hot water demand.
From the point of view of fault finding we know the boiler knows it’s got demand what we need to establish is why aren’t we getting heating or why are we not getting hot water. Turn the tap off and drop the front down and remove the diverter motor. Unclip the pin and take the motor out, remember you still have it in heating demand.
The little brass pin in the motor should be up, which is in the heating position. Now turn the hot tap on and the heating pin should go back inside. By retracting down inside we know its gone to hot water position.
This is a working motor and we know that it’s operating but what you’d actually get out in the field is a problem with either pin doesn’t come out or doesn’t go back in. You will know that it’s stuck in heating or hot water position.
We are going to do a further series of videos telling you how to test that with a multimeter going further forward but that’s just a quick check to prove if it’s the motor that’s causing us the problem.
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