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TROUBLESHOOTING
If the display module doesn’t power up after power is applied, check the Rc/Rh and
C terminals for 24VAC. If 24VAC is present, check the voltage between Vg and
V+. This voltage will be approximately 12-20VDC. If voltage is present, check the
polarity to make sure it is wired correctly. The display will not power up if polarity
is reversed.
If dashes appear for Option 01 in config and during reboot, the problem could be
the red pigtail being wired to Rc or Rh and the black pigtail being wired to C. If so,
remove the two- wire pigtail and connect to the V+ and Vg terminals.
Error Codes
“--” - If AC/HP Control cannot properly read room temperature, display will
indicate “- - ” and all outputs (except fan, if on) will turn off. In the case where the
installer has selected to average the local sensor and the remote room sensor, the
AC/HP display will alternate between “- - ” for the failed sensor and the temperature
sensed by the working sensor every 10 seconds. The control will operate from the
temperature sensed by the working sensor.
E1 - If the Display Module and the Equipment Control Module cannot
communicate via two- wire connection, an E1 will be displayed.
E2 - There is no E2 error message.
E3 - If AC/HP Control cannot properly read outdoor temperature, and it is needed
for proper operation, display will indicate “- - ” in the outdoor temperature location.
E4 - If AC/HP Control’s internal memory fails, E4 will be displayed. Replace
AC/HP Control.
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