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How to test Valiant flow switch

Discussion in 'Plumbing and Central Heating' started by mattyMoo63, 6 Feb 2021.

  1. mattyMoo63


    6 Feb 2021
    Thanks Received:
    United Kingdom
    I have a valiant Ecomax running hot and then cold.
    Running water slowly will keep the water warm
    How can I test the flow switch..it has three wires
    red, black and green
    red and black show constant voltage of 4.73 DC
    black and green show constant 57 ohms irrespective of the hot water tap being turned on or off ...
    somehow this dosent seem right ?
    appreciate any feedback
    pump and heat exchanger are good
    Last edited: 6 Feb 2021
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