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I had the heating elemnt replaced in my unit and since that time I don't have the air flow volume I had before it was replaced and now I can't cool my trailer. The air is real cold (my vents is real wet) but I don't seem to get enough air to cool my trailer. What could be my problem? Model #PGB030075-1 and Ser #0104617125.

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Some things that would change air flow in a system are:

Blocked/Clogged Return Air. Usually a dirty filter.

Blocked/Clogged A-Coil. Inside the coil box, you have to remove the cover that is on the coil itself, unless it's a downflow, then you can see on top of the coil if it is clogged or dirty. You can usually clean it with a small wire brush.

Fan Settings Have Been Changed. On the electrical board inside the furnace, you will have terminals that your fan motor wires connect to. You should have a terminal for heat, one for cool, and two that are marked as "Park". The BLACK wire from the motor will be the highest speed setting. You will have this information on the schematics on the back of the furnace door panel also, they are fairly easy to read. All the speeds are HIGH/MED HIGH/MED LO/LOW. The two speeds you don't want, you place on the PARK terminals.

Furnace Blower Motor Getting Weak. If there seems like there is no change in the speed settings, then your motor could be going out and would have to be replaced.

These are just a few possibilities that you can check out. Hope it helps and good luck!



Posted on Aug 01, 2010

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