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How close is it to a floor drain or other plumbing drain?
Check to be sure that there is water in the traps.

Thanks, I tries air but only up to 100#.

Thank you !

Have a good one. I have tried, plumbing snake, shop vac and a couple other thing that I probably should not mention here.

This is in a fur story residence. Who know how it is plumbed through the...

WOW that a good price, wish I knew where.... paid 210. 25#

Same story every year! It is all about the $$$$$$$$$$!

How much do you have and much do you want for it?

Replace the whole system. The new one will pay for itself in operation savings.

line restriction,low presseure(charge),filter,condensor dirty, bad compresor just too list a few. The list long. Have a service tech check it out.

your HVAC contractor will check that for you...before a furnace is selected! If not get another contractor.

What model Aprilaire?

No. Why would you not want to rinse? That is also a good way to check the drain.

BaldLoonie,why are 2 stage units not as efficient as single ?

bkliewer what co do your work for?

Turn your fan to the "on" position not auto, this will thaw the unit faster. good Luck. If is freezes again call for srvice.