I have a spillover system with a fan and return hole between the larger freezer
and the "refrigerator" side. The past week the refrigerator
side has been too warm, which of course means the freezer
isn't cold enough. The refrigerator
side has been getting into the low 40s where it used to stay pretty much around 35-38. Normally this is a sign that the freezer needs defrosting.
I normally have to defrost every 7-10 days if we have been on the boat
full time. The other day the temperatures were too warm and I defrosted again after only 3 days even though the ice layer didn't seem all that thick. Normally the refrigerator side temp would return to the 35-38 range shortly after a defrosting. But it isn't really cooling
down and this morning was 38.5 when I got up.
I got a thermometer for the freezer as the frig side has a digital controller for the fan with read out. I used to be able to get the freezer down to 17F, but now it doesn't want to go below 25F.
Things I've tried/checked:
- I redid the seals
as the frost of course is an air issue
- I checked the spillover fan operation and it's working
- I cleaned the evaporator (it was pretty dirty even though I have a filter in front of it). This made a big difference in air flow through the condenser and across the compressor
, but didn't seem to do anything far as freezer temp.
- I considered that it was just a lot warmer out. But when I closed up the boat
and ran the air conditioning
it didn't affect the freezer temp.
- the evaporator plate gets fully frost covered
- the compressor
appears to be running at full speed and is drawing about 5 amps (BD50 system)
I've only had the digital read out on the refrigerator side for about 6 months. So it has mainly been running in cooler weather
till recent so maybe my system has always had these temperatures. But that in my mind doesn't explain why the freezer could get down to 17 a week ago, but only 25 now.
Could it be that the pressure got high last week at the 17 degrees and dirty condenser and leaked some refrigerant?