precisiontemp hydronic heating problem

[katoomer]

We are having problems with the hydronic heating in our '09 ventana.
System seems to work fine for a few hours then the blower fans continue to run but blow cold air. Down below cannot hear the pump running and the supply line is cold while the return line is hot. Hot water is fine. Last fall we had a service guy replace the pressure relief valve after talking to PrecisionTemp. Worked fine for a few days last week when I took it out of storage and then after the first night of camping woke up to find the same problem had happened again. I suspect that the zone pump is seizing up.
Has anyone had similar problems?

[Saber77]

We've also had simillar problems with the Twin Temp on our 2009 Ventana. Had to replace the thermostat twice and after the second time, it has worked great ever since.

[katoomer]

Quote:

Originally Posted by Saber77 We've also had simillar problems with the Twin Temp on our 2009 Ventana. Had to replace the thermostat twice and after the second time, it has worked great ever since.

Do you mean the wall thermostat in the coach or one on the heating unit?

[Saber77]

It was the thermostat located in the large anti-freeze tank (not the overflow tank) -- if it does not work properly, the system will not operate.

[katoomer]

Quote:

Originally Posted by Saber77 It was the thermostat located in the large anti-freeze tank (not the overflow tank) -- if it does not work properly, the system will not operate.

Thanks for the suggestion