Question about Heating & Cooling
My hvac is not cooling. It is DATs/Zone controlled with a honeywell hz322. When I bypass the hz322 by shorting R W on the furnace control board heat runs fine. The HZ322 is reporting DATs temp limit exceeded even when the system has been sitting for days.... Any ideas on how to fix that?
Limit will open when exceeded heat at heat exchanger. possible cause restriction on air flow(blower speed too slow, dirty filter or weak limit switch itself). when unit cooling down limit will reset and start back like nothing was wrong
Posted on Nov 23, 2014
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Posted on Jan 02, 2017
SOURCE: My furnace works intermittently.
You may have a dirty flame sensor. There are a number of other possible causes as well. Rheem/Ruud/Weatherking furnaces also have problems with the connection on the blower deck.
The flame sensor sometimes must be bypassed around the MOLEX CONNECTOR in the deck due to humidity.
Hope this helps.
Posted on Jan 15, 2009
Is there a setting on your thermostat that makes the unit stay on for 10, 15, 20, 25 minutes after you reach set temp. You can change this setting by looking at your manual for the thermostat. Not sure if there is one for this thermostat but mine has one. Mine was running 15 min after set temp and making it cool down 2 degrees lower than set temp. Hope this helps.
Posted on Jun 25, 2009
This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.
Posted on Nov 12, 2009
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