Your refrigeration unit appears to be a standard simple reliable design with either a Danfoss BD2.5 or a BD3 compressor. Both compressors inside are fixed speed and motor rotation is controlled by an electronic Module through a 4 pin plug on compressor. The control module is a 102N3030 or a 3031 with an exterior fuse on bottom under a gray plastic cover. Question in picture, at left side there is part of a cooling fin what is this and is it connected in anyway to refrigeration unit?
There are a number of reasons why compressor stopped running: Module failed blowing fuse, Fan drawing more than 1 amp but still running, Someone in the last year has tampered with refrigerant, Thermostat or its wiring not completing a closed circuit and the most likely problem is a voltage spike do to age of boats wiring or DC power grid resistances.
If you follow troubleshooting below you will avoid an expensive service call.
Troubleshooting 4 pin modules consists of the following:
Check module fuse and refrigerator circuit breaker first.
1. Place jumper wire across thermostat terminals, Compressor still does not run.
2. Disconnect black fan wire from electronic module, Compressor runs replace fan. Compressor still does not run after fan ground wire is disconnected. If one of the 10 transistors in this fan fail it can cause module to prevent compressor from running.
3. Run correct size and correct polarity fused jumper wires direct from a fully charged battery to module in order to bypass all boat’s wiring. Volt meter readings are of no value, Compressor still does not run electronic module needs to be tested on another unit.
I closed my shop but after seeing what is being charged by boat refrigeration companies who will test modules charging $50 and charging as high as $385 for new 4 pin modules, I decided to test and sell modules for a fraction of what is currently being charged.
If your shipping address is in the US I will test your module on my Danfoss compressor refrigeration test stand. This test stand will run at max compressor load for a one hour. I will then return your module to you for a shipping and handling charge of $20. Ship module with return address and a personal check for $20 to:
Richard Kollmann
2430 Sugarloaf LN
Ft. Lauderdale FL 33312
New replacement Module
If you wish to purchase a new or serviceable unit from me later I currently have the following four pin modules:
Four pin modules for BD2, BD2.5 and BD3 twelve volt compressors only:
No used modules available at this time.
New module non Danfoss With improved cooling. $150 plus $15 shipping.
Modules will only be shipped to addresses in the US. If you want to purchase a new replacement module send personal check for $165 and return address to:
Richard Kollmann
2430 Sugarloaf LN
Ft. Lauderdale FL 33312
Because your unit is old and if it needs a new electronic module there is a risk that something is wrong that caused module to fail so most companies will refuse warranty of these modules. This is my electronic module warranty:
Any new module I sell can be returned for full credit without question within 30 days . Because of my own risk involved for the next 11 months I will return only 50% of the new units purchase price if module is returned within the first year.
Richard Kollmann
