Question about Refrigerators
I have the familiar issue with frost build up on the evaporator, which if unfrosted causes the fridge to stop cooling properly.
The heater works fine once connected directly to 220V, and reads about 130 Ohms.
The thermostat reading when closed is 0 Ohm.
The defrost timer operates fine - when moved manually to defrost mode it stops the compressor/ fan of the fridge. After about 30 minutes it automatically advances to cooling mode.
At defrost cycle I disconnected the heater to test the voltage across its relevant terminals and the reading is 206 Volts. This seems odd to me, as I expected the 220V reading. When the heater is connected the reading across it during the defrost cycle is 0 Volts.
I would appreciate any help.
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So you seems to have done your homework. all the inputs are great.
you said you have 206 volts at the heater connection prior to connecting the heater.
and would become zero once the heater is connected.
so you have a loose connection from the timer to the defrost thermostat then to the heater.
does the defrost thermostat you are talking about is the same as the bi-metal that we used to refer in our technical language.( it is the part that would open up as the temperature inside the evaporator rises to a certain level.)
because if you are referring to the fridge thermostat which controls the compressor. ( this is also 0 ohm when closed), then the problem could be in your bi-metal.
this is the part in between the timer and the defrost heater.
it terminates the power once the temperature of the evaporator coil is about 5 degrees Celsius.
here's what you can do.
run the fridge for a day ( so that we would be sure that the bi-metal is close) then put the heater in place, turn the timer to heating mode by turning it slowly.
then place the test leads across the bi-metal, if you can measure 220 volts then that is the problem.
it is not shorting out even with a freezing temperature. you can further test the system by putting a jumper wire between the bi-metal and you heater should be heating up now.
tnx 4 using fixya,
Posted on Oct 31, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Sep 28, 2016 | Hotpoint Refrigerators
So first thing you try is , perform,
manual defrost reset procedure.---------
The manual defrost
reset procedure is as follows : ----
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. Then check,if same frost is getting collected, then its defrost 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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