Product data
12
Table 6 – Troubleshooting
OPERATION FAULT
AMBER
LED
FLASH
CODE
POSSIBLE CAUSE AND ACTION
Standby – no call for unit op-
eration
None
On solid,
no flash
Normal operation
L o w --- st a g e C o o l / H e a t O p e r a -
tion
None 1, pause Normal operation
High-stage Cool/Heat Opera-
tion
None 2, pause Normal operation
System Communications
Failure
16
Communication with user interface lost. Check wiring to User Interface,
indoor an d outdoor units
Invalid Model Plug 25
Control does not detect a model plug or detects an invalid model plug. Unit
will not operate without correct model plug.
High Pressure Switch
Open
31*
High---pressure switch trip. Check refrigerant charge, outdoor fan operation
and coils for airflow restrictions.
Low Pressure Switch Open 32* Low pressure switch trip. Check refrigerant charge and indoor air flow
Control Fault 45 Outdoor unit control board has failed. Control board needs to be replaced.
Brown Out ( 230 v) 46
Line voltage < 187v for at least 4 seconds. Compressor and fan operation
not allowed until voltage>190v. Verify line voltage.
No 230v at Unit 47
There is no 230v at the contactor when indoor u nit is powered and cooling/
heating demand exists. Verify the disconnect is closed and 230v wiring is
connected to the unit.
Outdoor Air Temp Sensor
Fault
53
Outdoor air sensor not reading or out of range. Ohm out sensor and check
wiring.
Outdoor Coil Sensor Fault 55 Coil sensor not reading or out of range. Ohm out sensor and check wiring.
Thermistors out of range 56
Improper rela tionship between coil sensor and ou tdoor air sen sor. Ohm out
sensors and check wiring.
Low stage Thermal Cutout 71*
Compressor operation detected then disappears while low---stage demand
exists. Possible causes are internal compressor overload trip or start relay
and capacitor held in circuit too long(if installed)
High stage Thermal Cutout 72*
Compressor operation detected then disappears while high---stage demand
exists. Possible causes are internal compressor overload trip or start relay
and capacitor held in circuit too long (if installed)
Contactor Shorted 73
Compressor voltage sensed when no demand for compressor operation
exists. Contactor may be stuck closed or there is a wiring error.
No 230V at Compressor 74
Compressor voltage not sensed when compressor should be starting. Con-
tactor may be stuck open or there is a wiring error.
Low-stage T h ermal Lock-
out
81
Thermal cutout occurs in three consecutive low/ high---stage cycles.
low---stage locked out for 4 hours or until 24v power recycled.
High-stage Thermal Lock-
out
82
Thermal cutout occurs in three consecutive high/low---stage cycles.
high---stage locked out for 4 hours or until 24v power recycled.
Low Pressure Lockout 83
Low pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
High Pressure Lockout 84
High pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
* Sequence: Compressor contactor is de-energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.
T h e r m i d i s t a t M o d e l s T 6 --- P R H 0 1 --- A & T 6 --- N R H 0 1 --- A
w/ VS Fan Coil & 2 ---Stage Air Conditioner
T h e r m i d i s t a t M o d e l T 6 --- P R H 0 1 --- A & T 6 --- N R H 0 1 --- A
w/ VS Furnace & 2---Stage Air Conditioner
RVS/Heat Stage 2 O/W2/B
Heat Stage 1 W/W1
Compressor Low Y1
Compressor High Y/Y2
Fan G
24VAC Hot Heating Rh
24VAC Hot Cooling Rc
Dry Contact 1 D1
Dry Contact 2 D2
24VAC Common C
Humidify HUM
Outdoor Air Temp OAT
Remote Room Sensor RRS
OAT/RRS Return
SRTN
SRTN
Outdoor Sensor
Remote Room
Sensor
O
Y1
W1
G
W2
C
Y2
Y1
Y/Y2
R
C
DH
REMOVE J2
JUMPER FOR
HEAT STAGING
REMOVE J1 FOR
DEHUMIDIFY
MODES
Two-Stage
Air Conditione
r
Thermidistat
Variable Speed
Fan Coil
*
R
* See Humidifier Instructions for proper wiring.
Variable Speed
Furnace
Thermidistat
2-Stage
Air Conditioner
Heat Stage 2 O/B W2 W2
Heat Stage 1 W/W1 W1
Cool Stage 1 Y1 / W2 Y1
Cool Stage 2 Y/Y2 Y/Y2 Y/Y2
Fan G G
24VAC Hot Heating Rh R R
24VAC Hot Cooling Rc
Dry Contact 1 D1
Dry Contact 2 D2 DHUM
24VAC Common C COM C
Humidify HUM
Outdoor Air Temp OAT
Remote Room Sensor RRS
OAT/RRS Com SRTN
Outdoor Sensor *
Remote Room
Sensor *
* See Humidifier Instructions for proper wiring
*
A09566 A09565
Fig. 10 -- Thermidistat Wiring with 2--Stage Puron refrigerant Air Conditioner
24ANB7 / 24ANB1