Danfoss-Secop Compressor Fault Codes Explained

question-mark-light-string-dreamstimemedium 63743826Anyone with a refrigeration system on their boat or RV that is powered by a Danfoss (now Secop) BD35 or BD 50 compressor should be aware of the diagnostic diode function, which, with a simple flashing LED, tells you the fault reason that caused your compressor to stop.   Much of the following also applies to the BD80 compressor controller.

By connecting a simple 10mA 12v LED across the "D" terminal and a "+" terminal on the electronic controller attached to the compressor, you will have added a powerful fault-finding tool that may save you a lot of time and trouble later on.

Why the manufacturer elected not to incorporate a diode in the controller housing is anyone's guess, but Coastal Climate Control comes to the rescue here with three options:

1. A Coastal Diagnostic LED kit with an LED that you can either install permanently or keep in the spares kit.

2. A Merlin II compressor speed controller that also incorporates a diagnostic LED.

3. A Guardian digital thermostat/compressor speed controller that features a diagnostic LED

OK, so now you have some form of diagnostic LED installed, what is it going to tell you? If your fridge or freezer system unexpectedly stops working, i.e. other than the thermostat stopping the compressor, and you go take a look at the diagnostic LED, what exactly are you looking for?

Read more: Danfoss-Secop Compressor Fault Codes Explained

Conundrum - New or Rebuilt Parts

good idea-bad-idea dreamstimemedium 28973031This is a tale of two choices – new or rebuilt parts for electrical repairs.

We were recently asked by a marine air conditioning service company to quote a price for a replacement electrical box on a now obsolete chiller system. We were informed that the original box had been seriously compromised due to water ingress, and also that there were signs of some components, wires, and/or connections having scorch marks and other signs of overheating. This electrical box carries both high voltage and high current, and so carries a significantly high fire risk if compromised.

The servicing company ruled out any possibility of them rebuilding the electrical box on safety grounds due to its condition, and so sought a complete new, factory-made replacement. Unfortunately,

Read more: Conundrum - New or Rebuilt Parts
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