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Old 02-03-2020, 20:28   #1
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Frigoboat / MK2 Thermostat

I have a frigoboat and this thermostat,



The thermostat is reading "-" which I believe means a shorted probe.

I have not found a source for just the probe, does anyone know where to source one?
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Old 02-03-2020, 20:37   #2
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Re: Frigoboat / MK2 Thermostat

Quote:
Originally Posted by kev_rm View Post
I have a frigoboat and this thermostat,



The thermostat is reading "-" which I believe means a shorted probe.

I have not found a source for just the probe, does anyone know where to source one?
This is a hunch... check how it is connected, if it is 3 conductors like this one... it may be a DS18B20 which is used very often.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 03-03-2020, 06:59   #3
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Re: Frigoboat / MK2 Thermostat

Hi, I suspect you've found the correct sensor at Coastal Climate Control. Sensors need to be matched to the part they are designed to work with, to match the programming in the unit and in your case that is the Coastal Climate Control MKII/MK3 digital thermostat.
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Old 03-03-2020, 19:33   #4
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Re: Frigoboat / MK2 Thermostat

Check the connections at the display, then look at the distance from box to display, if there is solder/butt connector in there, like the sensor wire wasn't long enough to reach the display, check that as well.
A resistive/open /corroded connection will cause the error as well as an actual faulty sensor.
There 2 types of sensors.
NPC or PTC.
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Old 03-03-2020, 21:27   #5
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Re: Frigoboat / MK2 Thermostat

Further troubleshooting:

The thermostat only displays one (of three) dashes, which is not what the manual says is open probe. It also does not respond to the "Set" button when I tried to do a factory reset or other setting per the manual.

I'll call coastal in the AM. I suspect the thermostat unit itself is toast.
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Old 04-03-2020, 06:02   #6
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Re: Frigoboat / MK2 Thermostat

Installation and operation instructions for the Coastal MKii digital thermostat.
https://www.coastalclimatecontrol.co...ons_-_2015.pdf

AC/DC Controller Wiring Instructions
https://www.coastalclimatecontrol.co...ng_Diagram.pdf
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