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In-floor radiant heat help

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I've got in-floor radiant heating in my office which is an extension of my garage.

Worked like a charm until we had a bad cold spell for about a week. Now it still kicks on, but no heat whatsoever.

I changed the thermostat hoping that was it. Didn't fix it. Also closed off the valves and released the air - no help.

It's a Rheem water heater. Both circulation pump sound/feel to be working fine. But the water heater (and pipes) are cold to the touch.

No pressure on gauge.

Here is the setup:
https://drive.google.com/file/d/1TjzjhKQdOaoBgklJtxyDTmc7bqoxkhf4/view?usp=sharing
https://drive.google.com/file/d/1irLINZyMFDZoJrLaNjzfHzj88_eNt_kt/view?usp=sharing

Any help is greatly appreciated!

Comments

  • Ironman
    Ironman Member Posts: 7,379
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    Have you checked to make sure that you have power to the water heater? The high limit isn’t tripped?

    It could also be a bad thermostat or heat element.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • hot_rod
    hot_rod Member Posts: 22,251
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    could be a frozen area near the door?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • bwoodard28
    bwoodard28 Member Posts: 7
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    Ironman said:

    Have you checked to make sure that you have power to the water heater? The high limit isn’t tripped?

    It could also be a bad thermostat or heat element.

    Not sure about the heat element but I did check the power and replaced the thermostat to be safe.
  • bwoodard28
    bwoodard28 Member Posts: 7
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    hot_rod said:

    could be a frozen area near the door?

    Would a frozen area by the door cause the whole system to stop working or just that zone?
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,044
    edited January 2023
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    It's a Rheem water heater. Both circulation pump sound/feel to be working fine. But the water heater (and pipes) are cold to the touch.
    You need to go thru the process of elimination.
    1. You say the water heater is not hot.
    2. Do you have power to the water heater? How are you measuring for power?
    3. Does the Power go thru the thermostat to the element?
    4. Is the element in the water heater working? A shorted or open element will cause no heat
    That is where I would start.
    No pressure on gauge.

    If a water heater is powered and there is no water in the tank, the elements will overheat and fail.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    bwoodard28