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Thank you HVAC but you see I'm in Canada and I was wondering about Home Depot.

I had the same problem and it was air in the line. There should be bleeders on each heater at one end. If the pump is on all the time just crack that little valve open and see if air comes out. ...

Here is where I would start. Start by taking the wires off the TS and shorting them together the furnace should now come on if it is calling for heat.

What is the best chemical pipe cleaner and how do you use it? I have a outdoor wood furnace hydronic system and I neglected adding rust inhibitor. Chunks are breaking off and screwing up the zone...