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Display was dull and hard to read, had only one tank heating, replaced battery and now cant get into setup to set tank temps.
Have sourced temp controllers and was looking at retro fitting these to...

My display acts up once in a while looking dead. Pushing the reset buttons usually gets it back working in case you haven't tried that.

You might also try a pm to Greg Blank. He used to service...

I have these also thanks for reply
Issue is that display is faulty and planning to replace controllers
Just trying to workout what wire does what
Will keep trying

A client has left us with a CP51 main module for repair
The issue is that it is in poor condition and we have a manual but no technical
info on this unit ie Circuit diagrams Etc to get this unit...