Coleman-Mach RV fault codes

Coleman-Mach (built by Airxcel/RVP) is a major RV air-conditioner brand. Newer units with electronic thermostats show E-codes for sensor, freeze and communication faults.

Air Conditioner

E1
The single-zone LCD thermostat has lost its communicatio… E2
The indoor (room) temperature sensor reads as an open ci… E3
The indoor (room) temperature sensor is reading as short… E4
The outdoor temperature sensor (fitted on heat-pump-equi… E5
The evaporator freeze sensor is open or reading out of r… Er
On the Coleman-Mach multi-zone LCD thermostat, 'Er' appe… Heat-pump strike condition
In electric-heat (heat-pump) mode the thermostat flashes… HI
The thermostat senses a temperature above the top of its… LO
The thermostat is showing the room temperature it senses… PTC fuse open (no power)
The digital wall thermostat contains a self-resetting PT… Short-cycle / compressor delay
On the digital wall thermostat, the HVAC state segment b… Wireless comms error
On older Coleman-Mach wireless thermostat systems, the g…