Table6 - Troubleshooting
Standby - no Call for unit op: On solid,
eration None no flash Normal operation
Low-stage Cool/Heat Opera-
tion None 1, pause Normal operation
High-stage Cool/Heat Opera-
tion None 2, pause Normal operation
System Communications 16 Communication with user interface lost. Check wiring to User Interface,
Failure indoor and outdoor units
Control does not detect a model plug or detects an invalid model plug. Unit
Invalid Model Plug 25
will not operate without correct model plug.
High Pressure Switch 31 * High---pressure switch trip. Check refrigerant charge, outdoor fan operation
Open 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.
Line voltage < 187v for at least 4 seconds. Compressor and fan operation
Brown Out (230 v) 46 not allowed until voltage> 190v. Verify line voltage.
There is no 230v at the contactor when indoor unit is powered and cooling/
No 230v at Unit 47 heating demand exists. Verify the disconnect is closed and 230v wiring is
connected to the unit.
Outdoor Air Temp Sensor 53 Outdoor air sensor not reading or out of range. Ohm out sensor and check
Fault wiring.
Outdoor Coil Sensor Fault 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
Thermistors out of range 56
sensors and check wiring.
Compressor operation detected then disappears while low---stage demand
Low stage Thermal Cutout 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
High stage Thermal Cutout 72* 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.
Compressor voltage not sensed when compressor should be starting. Con-
No 230V at Compressor 74 tactor may be stuck open or there is a wiring error.
Low-stage Thermal Lock- 81 Thermal cutout occurs in three consecutive low/high---stage cycles.
out low---stage locked out for 4 hours or until 24v power recycled.
High-stage Thermal Lock- 82 Thermal cutout occurs in three consecutive high/low---stage cycles.
out 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 switch trip has occurred during 3 consecutive cycles. Unit
High Pressure Lockout 84 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.
RVS/Heat Stage 2
Heat Stage 1 [_'W-'_'_'-
Compressor Low _ -
Compressor High
Fan
24VAC Hot Heating i'{_ _-
24VAC Hot Cooling L [_-_
Dry Contact 1
Dry Contact 2
24VAC Common _ ......
Humidify
Outdoor Air Temp [_- *
Remote Room Sensor _-
OAT/RRS Return
SRTN
Vadable Speed Two-Stage
Fan Coil Air Conditioner
[]
--::7---
REMOVE J2
JUMPER FOR
--- -{W2 _-- _P HEAT STAGING
....... @
-__..... D ..........
I ,s, REMOVE Jl FOR
II _ ,3_DEHUMiDIFY
r--- _J_ MODES
i i
--'
i
RemoteRoom
RAn_nr *
* See Humidifier Instructions for proper wiring.
A09566
Thermidistat Models T6-PRH01 -A & T6-NRH01 -A
w/VS Fan Coil & 2-Stage Air Conditioner
Thermidistat 2-Stage
Air Conditioner
Heat Stage 2 _"
Heat Stage 1 _"
Cool Stage f FY'_-_2_"
Cool Stage 2 _ -
Fan _ -
24VAC Hot Heating _[_[_""
24VAC Hot Cooling _
Dry Contact 1 _-
Dry Contact 2 T__]_..
24VAC Common [_C'_ -
Humidify
Outdoor Air Temp [_'O"_ -
Remote Room Sensor _-
OAT/RRS Corn
Vadable Speed
Furnace
......... [_
-: IOutdoorS.....*l ii
L ................................
* See Humidifier Instructions for proper wiring
A09565
Thermidistat Model T6-PRH01 -A & T6-NRH01 -A
w/VS Furnace & 2-Stage Air Conditioner
Fig. 11 - Thermidistat Wiring with 2-Stage Puron refrigerant Air Conditioner
12
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