Waceo CF50 problem
Submitted: Friday, Nov 29, 2019 at 12:23
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Paul W33
My CF50 has ran with no problems for a couple of years but recently ill go to it and the temperature will be at 10 degrees, for instance. Even though it is set for 2 degrees. The green light is on and looks as if the fridge is running fine.
If I turn it off for a while then back it will start to cool down again.
Anyone witnessed this?
Reply By: Frank P (NSW) - Friday, Nov 29, 2019 at 12:35
Friday, Nov 29, 2019 at 12:35
I had a random similar issue with a no-name Chinese fridge modified with a Danfoss BD-35 compressor, which I believe is what is in the Waeco. (The
suspension in the original Chinese copy of the Danfoss, a Domus, failed, hence the upgrade.)
The problem turned out, after trial and error, to simply be a bad connection in the ribbon cable between the display circuit board and the main controller board (not the internal Danfoss one). Removing the ribbon, cleaning the connectors and re-installing fixed it.
Your problem may be something as simple as that.
If you're handy with
tools it may be worthwhile carefully poking around a bit, checking for loose and dirty connections.
AnswerID:
628847
Reply By: RMD - Friday, Nov 29, 2019 at 12:44
Friday, Nov 29, 2019 at 12:44
Paul
Not sure if same fault, but I repaired one which had the NTC thermistor faulty. Some seem to fail and give wrong resistance reading to the comparator circuit on the board.
If you can open the circuit part and unplug the two wire cable going down into the insulation, it should measure around 10,000ohms when at 20C ambient, if not it may be faulty. Because they carry a minute current to detect the resistance, moisture and applied temp cause
the junction of the NTC chip to not work
well. I purchased a 10,000 ohm NTC resistor and soldered two wires to it which were then connected to same circuit contacts. The fridge then worked as required.
Using a very powerful LED light source shining into the base you can see where the sensing end is under the plastic liner at the bottom. Usually midway other end to compressor. Knowing that, I cut a ciggy packet sized square out of the case base to access the faulty sensor. On the wire, I cut off the old sensor and after attaching the new one with wires now attached, all was securely sealed and glued to underside of plastic liner. Fridge now has worked properly for two years. The void I carved in the case was filled with expanding foam and the cut out case bit simply soldering iron welded/plastic welded to repair that cut out. There are a few faults happen with them, this is only one of those. Hope you find it.
AnswerID:
628848
Reply By: HKB Electronics - Friday, Nov 29, 2019 at 20:42
Friday, Nov 29, 2019 at 20:42
What I have found, first off suspect a power problem to the fridge, ie faulty lead or plug etc.
If power ok then most problems seem to be caused by either the temperature sensor as written above, or the voltage regulator.
In my particular unit though it turned out to be the processor PCB, on initial turn on compressor would run for some time and cool down the fridge, then cycle on and off rapidly, temperature control had little affect,
turning it down would result in compressor running for a short time then going back to rapid cycling.
AnswerID:
628856