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Thread: Raypak MVB Boiler

  1. #1
    Join Date
    Oct 2008
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    Raypak MVB Boiler

    i am having alot of trouble with flame failure on MVB boilers. Sometimes the display reads FP. The flame sensor is new and the burne is clean.

  2. #2
    Join Date
    Jan 2020
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    So we had the same issue with a set of 5 Mvb 2003. Couldn't figure it out Ray pak told us to buy new units.. Come to find out the boilers were losing the min of 20volts coming from the transformer (120/24). We wired in another transformer that only sent power to the gas valve itself. Since we wired in this new transformer we have had zero blower air trips.

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