Coleman-Mach 9420*381 / 9420*382 and the 8330-series wall thermostat fault codes
The 5 fault codes below are the ones that apply to this Coleman-Mach air conditioner family. The other 7 Coleman-Mach air conditioner codes in our database belong to different model families — they are listed further down so you do not troubleshoot against the wrong table.
Covered model numbers
8330-series Digital Wall Thermostat9420*3819420*382
Not on the list? Check the rating label before you troubleshoot — the code table below will not apply. Where to find it →
Fault codes on the Coleman-Mach 9420*381 / 9420*382 and the 8330-series wall thermostat
In electric-heat (heat-pump) mode the thermostat flashes the 'Elec' segment while it bring… HI info
The thermostat senses a temperature above the top of its measurable range. On the digital … LO info
The thermostat is showing the room temperature it senses is below the bottom of its measur… PTC fuse open (no power) warning
The digital wall thermostat contains a self-resetting PTC (resettable) fuse on its 12 VDC … Short-cycle / compressor delay info
On the digital wall thermostat, the HVAC state segment blinks to show a built-in short-cyc…
Codes that do not apply to this model
These 7 codes exist on other Coleman-Mach air conditioners. If your unit is showing one of them, it is not from this family — re-check the model number on the label before acting on any of these.
The single-zone LCD thermostat has lost its communication link with the rooftop unit's con… E2
The indoor (room) temperature sensor reads as an open circuit or its value is outside the … E3
The indoor (room) temperature sensor is reading as shorted. As with E2, the thermostat can… E4
The outdoor temperature sensor (fitted on heat-pump-equipped models) is open or reading ou… E5
The evaporator freeze sensor is open or reading out of range. Because the thermostat can n… Er
On the Coleman-Mach multi-zone LCD thermostat, 'Er' appears in the temperature area of the… Wireless comms error
On older Coleman-Mach wireless thermostat systems, the green system LED on the ceiling/mai…
Where the model number is
On the rooftop unit under the outer shroud, and usually repeated on a sticker inside the interior ceiling assembly after removing the filter cover.
Sources
- Installation, Operation & Application Guide for Digital Wall Thermostat 9420*381 & 9420*382 — Airxcel, Inc. / Coleman-Mach (RV Products Division) (Doc 1980R189, Compressor/Elec Heat Short Cycle Protection (DOB) section)
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