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OAT Thermistor must be
locked in place with spherical
nib end facing towards the
front of the control box
Fig. 8 - - Outdoor Air Thermistor (OAT) Attachment
OPERATION
Standby - no call for unit op-
None
eration
Low---stage Cool/Heat Opera-
None
tion
High-stage Cool/Heat Opera-
None
tion
Invalid Model Plug
High Pressure Switch Open
Low Pressure Switch Open
No 230v at Unit
Outdoor Air Temp Sensor
Fault
Outdoor Coil Sensor Fault
Thermistors out of range
Low stage Thermal Cutout
High stage Thermal Cutout
Contactor Shorted
Low-stage Thermal Lockout
High-stage Thermal Lock-
out
Low Pressure Lockout
High Pressure Lockout
* Sequence: Compressor contactor is de-energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.
Table 6 - TROUBLESHOOTING
AMBER
LED
FAULT
FLASH
CODE
On sol-
id, no
Normal operation
flash
1, pause
Normal operation
2, pause
Normal operation
Communication with user interface lost. Check wiring to User Interface, indoor
16
and outdoor units
Control does not detect a model plug or detects an invalid model plug. Unit
25
will not operate without correct model plug.
High---pressure switch trip. Check refrigerant charge, outdoor fan operation
31*
and coils for airflow restrictions.
32*
Low pressure switch trip. Check refrigerant charge and indoor air flow
45
Outdoor unit control board has failed. Control board needs to be replaced.
Line voltage < 187v for at least 4 seconds. Compressor and fan operation not
46
allowed until voltage>190v. Verify line voltage.
There is no 230v at the contactor when indoor unit is powered and cooling/
47
heating demand exists. Verify the disconnect is closed and 230v wiring is
connected to the unit.
Outdoor air sensor not reading or out of range. Ohm out sensor and check
53
wiring.
55
Coil sensor not reading or out of range. Ohm out sensor and check wiring.
Improper relationship between coil sensor and outdoor air sensor. Ohm out
56
sensors and check wiring.
Compressor operation detected then disappears while low---stage demand
71*
exists. Possible causes are internal compressor overload trip or start relay and
capacitor held in circuit too long(if installed)
Compressor operation detected then disappears while high---stage demand
72*
exists. Possible causes are internal compressor overload trip or start relay and
capacitor held in circuit too long (if installed)
Compressor voltage sensed when no demand for compressor operation
73
exists. Contactor may be stuck closed or there is a wiring error.
Compressor voltage not sensed when compressor should be starting. Contac-
74
tor may be stuck open or there is a wiring error.
Thermal cutout occurs in three consecutive low/ high---stage cycles.
81
low---stage locked out for 4 hours or until 24v power recycled.
Thermal cutout occurs in three consecutive high/low---stage cycles.
82
high---stage locked out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles. Unit oper-
83
ation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 3 consecutive cycles. Unit oper-
84
ation locked out for 4 hours or until 24v power recycled.
OCT Thermistor must be
secured tight on the liquid tube.
Fig. 9 - - Outdoor Coil Thermistor (OCT) Attachment
POSSIBLE CAUSE AND ACTION
11
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