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Old 10-19-2015, 09:24 AM   #1
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Hydro Hot Zone Not Working

I have a 2005 Alpine Coach, the Hydro Hot unit has all green lights on the control panel, so I assume all zones should be working. However, 1 zone is blowing cold. What could be the cause?

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Old 10-19-2015, 09:28 AM   #2
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Originally Posted by Cverhelle View Post
I have a 2005 Alpine Coach, the Hydro Hot unit has all green lights on the control panel, so I assume all zones should be working. However, 1 zone is blowing cold. What could be the cause?
Check the zone 1 pump to make sure it is working. If so, tap the brass check valve near the pump with a small hammer to see if it is stuck. A stuck check valve will prevent the heated coolant from circulating.

'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
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Old 10-19-2015, 07:04 PM   #3
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If you've owned the unit for some time and this zone worked in the past then most likely a zone pump or the check valve. We had a zone that didn't work from day one. Turned out to be a kink in the PEX line for that zone.
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