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Thread: Why does my forced hot air furnace not heat above 60 degrees?

  1. #1
    DIY Junior Member nicola's Avatar
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    Default Why does my forced hot air furnace not heat above 60 degrees?

    Why does my forced hot air furnace not heat above 60 degrees?

  2. #2
    In the Trades Tom Sawyer's Avatar
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    Could be a whole bunch of reasons.

    Undersized furnace for the load or furnace not fired at high enough rate to keep up with the loss
    Plugged filter
    Blower not running or not running fast enough
    High limit set too low
    Undersized duct or broken duct work
    Insufficient return air
    Bad or mis-adjusted thremostat
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    Plumber jimbo's Avatar
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    Are you gas or a heat pump? If heat pump, check the circuit breaker on the backup electric heaters.

    What has changed recently? Did the heat use to work and now it doesn't? Anything new like a thermostat, air handler or furnace parts???

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