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Defrost timer hi, came across a fisher and paykel fridge, all completely iced up and was restricting evap fan, when defrosted evap fan ran fine and had continuity through the heating element. however when i turned defrost timer around so it clicked into defrost i was not geting any voltage to the element. and then after about 5 to 10mins or so the defrost cut out and refrigeration began again. would u suggest that the defrost timer is stuffed? would a defrost termination t/sat have caused it to start refrigerating again? i wasnt sure how long they normally stay on defrost and i couldnt read the wiring diagram on it as it was all ripped. cheers

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  • Expert
  • 248 Answers

Sounds as if it is faulty but first try turning the power off / defrost / de-ice then try again.

Posted on Apr 09, 2017

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Posted on Jan 02, 2017

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zeusfaber
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SOURCE: evaporator fan jams with ice buildup from drain

Could be that, or it could be the temperature sensor on the evaporator - if that goes, then as soon as the freezer starts a defrost cycle, it will think it's got the evaporator hot enough and will start cooling again.

Suggest you let the freezer thaw out then, with a voltmeter connected across the terminals on the board which connect to the sensor, turn the freezer on and see if the sensor reacts sensibly to the evaporator cooling down. It's usually done with a thermistor, but just for the moment, I can't remember whether it's usually a PTC or an NTC.

That way, if it is the sensor, you'll be spared the expense of replacing a serviceable pcb.

A.

Posted on Apr 13, 2008

  • 1073 Answers

SOURCE: evaporator fan blade jams in ice buildup

check the defrost bimatal or defrost thermanstat it will be located on the evaperator suction line (large line) it should read continuity with the ref cold if it showes continuity then the defrost timer is the problem

Posted on Apr 13, 2008

  • 958 Answers

SOURCE: Defrost heater wont heat up

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,

drcool

Posted on Oct 31, 2008

woodchuck789
  • 4070 Answers

SOURCE: Viking refrigerator with bottom freezer always running

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air
check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

Posted on Jul 05, 2009

  • 1 Answer

SOURCE: measurement of defrost heater elemnt resistance in E 442B

yes, should be 165

Posted on Aug 06, 2009

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check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

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