Waterfurnace FP lockout

Discussion in 'Maintenance and Troubleshooting' started by ABCO Heating, Feb 2, 2011.

  1. ABCO Heating

    ABCO Heating Member

    I keep getting a FP lockout on my W/W HP. My loop temps are 32 deg and thats what the FP sensor reads when i look at it on the display. My control is set to CL which is good to 15 deg. Is it possible that my sensor is going bad? Maybe my loop fluid concentration is not strong enough icing up my coax causing it lockout?

  2. urthbuoy

    urthbuoy Well-Known Member Industry Professional Forum Leader

    I've seen both happen - sensor failure and low antifreeze %. Add in a faulty board as a possibility.

    These type of diagnostics can be mentally draining. Long term monitoring helps nail down the issue quickly.

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