My first question is there a $3 troubleshooting LED installed on your BD35 compressor? If LED flashes a code how many times does it flash every four seconds?
Has anyone tampered with refrigerant or connected gauges to this unit?
How do you know the compressor is actually running is it getting warm after running 20 minutes?
How long does it take to drop battery
bank voltage to 12.5 volts?
The actual time compressor runs before shutting down can help pinpoint trouble 60 to120 seconds can indicate Danfoss control module has a problem maintaining steady three phases to compressor field coils. If compressor stops in less than 30 seconds there is a low voltage spike in boats wiring
or the fan is drawing too much current
. One to two minutes running time could mean a poor ground in wire from battery ground to Danfoss module's large minus terminal.
Standard tests without trouble LED codes on Danfoss BD compressors
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.