Question about Carrier Science & Laboratory
Unit completely frozen over
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: system does not go into defrost
Did you check the solenoid on the reversing valve? Has the compressor ever been replaced?
Most reversing valves are normally in heat pump mode, and when the solenoid is energized, it is in A/C mode (in summer cooling, the valve is energized.). If the solenoid is bad, then the unit can not switch to defrost.
If the compressor has been replaced, there is a chance that the reversing valve might have some trash in it, preventing it from switching over. Lightly tap on the valve when defrost or A/C mode is being asked for.
Posted on Jan 22, 2009
SOURCE: Unit will not go into defrost.
There is a good chance, if the defrost timer is mechanical, that you can rotate (nudge) the timer to see if it get's going.
Most commercial refrigeration does not use a defrost thermostat, and a lot of it does not use a heater (they use a hot gas bypass valve and pump hot gas through the evaporator, rather than through the condensor.).
Let me know if you need further help.
Posted on Feb 04, 2009
Check your defrost heater element again, if ok change control module.
Posted on Dec 20, 2011
Tips for a great answer:
Oct 10, 2016 | Carrier Heating & Cooling
Dec 13, 2007 | Viking DDBB363 Bottom Freezer Refrigerator
on Jan 30, 2010 | Heating & Cooling
Aug 31, 2011 | Kenmore Refrigerators
First unplug the unit
from main power outlet. Then empty whole unit completely. Then keep both the
doors open. Wait for 24 hours. All the ice collected on the coils and in the
freezer section will get melted. Clean the water from the sections.
Then Connect the power cord of the unit to main power outlet after 24
hours/.Then set the temperature to normal in both fridge and freezer section.
It will take near to 4 hours to get run in its proper cooling cycle. Then
check, if the problem returns again. Then its defrost board problem.
If it's again building up ice that means the unit is not defrosting. It's starting the cooling procedure, and then while defrosting, it's not working. The defrost assembly consists of three main parts. The defrost thermostat, the defrost heater and defrost board. Any of the one is not functioning. When thermostat sense the maximum cooling, it triggers the defrost heater to start heating and this defrosts the ice collected on the coils and the system works. Both thermostat and heater are controlled by defrost board. First the thermostat and defrost heater to be checked, if both check ok by meter and visually, then its defrost board causing the problem. You can get required parts from from online sites like: --- www.repairclinic.com or from searspartsdirect online site. --------- This should help.Thanks.Helpmech.
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