Question about Heating & Cooling
During cold weather my outdoor condensor unit will ice up. Which defrost part is most common to fail causing unit to ice up? I've been told there are 3 parts to the defrost cycle - circuit board, thermostat and sensor. Which is first to replace to troubleshoot? Thank you.
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Posted on Jan 02, 2017
Make sure ALL moisture and noncondensables are evacuated while the system is down.I would have the line flushed to remove all remnants of burnout.Actually with the age of the unit and amount that needs repaired I would change the unit out to a 410a system and start over.
Posted on Nov 02, 2008
What its telling you is that there is an outdoor "thermostat" that senses the outdoor temperature.
The system has found a failure on this area.
It is telling you to check the sensor to see if its actually the sensor thats bad, or something else.
Then its telling you to check the wiring and connection of the sensor to the control board for any loose wiring or broken connections, and to repair it if so.
It then says if niether of those two checks reveal any problems that the problem is the board itself and it should be replaced.
To answer the question, resetting it probably will not work.
There is a small chance that due to power surge, flickering lights, or just a fluke one time glitch that there is nothing rally wrong and resetting would work.
95% chance that is not so.
Posted on Dec 10, 2008
SOURCE: burn out circuit board
hi! there! replace the burn out circiut board,what ever you pull out the same thing you put back just be sure that has the same model and specification,calibrate and test overload protection,defective overload protection replaced to prevent any burn out,short circuited mostly came to burn those thing that's why imposing preventive maintenace schedule for this kind of large ac central unit is very much significant.mostly timer delay circuit malfunction on large scale unit supplying by three phase a/c source on central control panel board.when ever replacement occured try to put mark or list color coding of specific terminals to connect and isolate short circuit make possible to detect at once before installing the new one and make make record on this for future reference we have several cases like that after buying a new one and replaced still burn again,the common cases is that they did not find the cause of short circuit connection they just relay on circuit board burn out,so it better to make assured that every thing is fine before installing the new one.specially on supply source of circuit.,relay on diagram and manuals take and check all data source as reference this will be a great help.take all necessary precaution this should be done by qualified technical ac support,have a nice day and regards
Posted on Mar 31, 2009
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