33-00135EFS—07
14
No outdoor
temperature shown
on thermostat
No wired outdoor
temperature sensor
connected to ERM, or
device configured as
boiler
Connect outdoor
temperature sensor
to S1/S1 terminals.
Device only reports
outdoor temperature
temperature when
configured as
compressor.
Thermostat shows “—”
for outdoor
temperature
Wired outdoor
temperature sensor
failed
Check sensor for
short circuit or open
circuit.
Outdoor temperature
reading at thermostat
is too high
Sun load on sensor
Verify outdoor
temperature sensor is
not in direct sunlight.
May need to use
longer wire to mount
in ideal location.
Compressor doesn’t
turn on, “Y” LED is
blinking
5-minute compressor
lockout after power
cycle
Wait 5 minutes,
compressor will turn
on after safety
timeout.
Emergency backup
control doesn’t
function
(if configured as
boiler)
No valid indoor
temperature sensor
Check sensor for
short circuit or open
circuit, or install
indoor temperature
sensor on S1/S1
terminals.
Symptom
Possible Cause
Action
33-00135EFS_D.book Page 14 Friday, September 8, 2017 1:59 PM