Carrier 50VS specifications Troubleshooting

has reached acceptable levels, the unit microprocessor will power on automatically and resume previous operation.

LEAVING WATER TEMPERATURE SENSOR FAIL- URE (LWT) — If the leaving water temperature thermistor fails, it will not affect the operation of the unit. This sensor is for monitoring purposes only.

DISCHARGE AIR TEMPERATURE SENSOR FAILURE (DAT) — If the discharge temperature thermistor fails, it will not affect the operation of the unit. This sensor is for monitor- ing purposes only.

FREEZE PROTECTION 1 TEMPERATURE SENSOR FAILURE (FP1) — If the freeze protection 1 thermistor fails for 30 continuous seconds an FP1 lockout will occur. The

compressor will then be deenergized and the blower will deen- ergize 15 seconds after the compressor is deenergized. The sen- sor must be replaced if this lockout occurs.

FREEZE PROTECTION 2 TEMPERATURE SENSOR FAILURE (FP2) — If the freeze protection 2 thermistor fails for 30 continuous seconds an FP2 lockout will occur. The compressor will then be deenergized and the blower will deen- ergize 15 seconds after the compressor is deenergized. The sen- sor must be replaced if this lockout occurs.

If unit performance during any mode appears abnormal, re- fer to Table 13.

Table 13 — Troubleshooting

	ERROR CODE	SYSTEM WARNING (FLASH)				SYSTEM LOCKOUT (STEADY
FAULT DESCRIPTION							ON)			POSSIBLE FAULT CAUSE
	(COMMTSTAT)
		LED1	LED2	LED3	LED4	LED1	LED2	LED3	LED4
High Pressure Lockout	Er 1	OFF	OFF	OFF	FLASH	OFF	OFF	OFF	ON	Low Airflow (Heating), Low
< 600 psi										Water Flow (Cooling)
Low Pressure Lockout	Er 2	OFF	OFF	FLASH	OFF	OFF	OFF	ON	OFF	Low Refrigerant Charge
< 40 psi
Freeze Protection, Air	Er 4	OFF	OFF	FLASH	FLASH	OFF	OFF	ON	ON	Water Temperature < 35 F
Side										or < 15 F (Heating)
Freeze Protection, Air	Er 5	OFF	FLASH	OFF	OFF	OFF	ON	OFF	OFF	Blower Failure (Cooling)
Side < 35 F
Condensate Overflow	Er 9, Er 10	OFF	FLASH	OFF	FLASH	OFF	ON	OFF	ON	Clogged Drain Line
Over/Under Low Voltage
Protection, 18-vac >	Er 11	OFF	FLASH	FLASH	OFF	OFF	ON	ON	OFF	Loss of Power, Brown Out
voltage, 30-vac
LWT Sensor Failure (Low	Er 13	FLASH	OFF	OFF	OFF	N/A	N/A	N/A	N/A	Sensor Resistance Above
Water Temperature)										or Below Specification
DAT Sensor Failure										Sensor Resistance Above
(Discharge Air	Er 14	FLASH	OFF	OFF	FLASH	N/A	N/A	N/A	N/A
										or Below Specification
Temperature)
FP1 Sensor Failure	Er 15	FLASH	OFF	FLASH	OFF	ON	OFF	ON	OFF	Sensor Resistance Above
(Freeze Protection)										or Below Specification
FP2 Sensor Failure	Er 16	FLASH	OFF	FLASH	FLASH	ON	OFF	ON	ON	Sensor Resistance Above
(Freeze Protection)										or Below Specification

LEGEND

LED — Light-Emitting Diode

NOTE: Warning LEDs and error codes are found on the system con- trol board.

Copyright 2008 Carrier Corporation

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500046-01 Printed in U.S.A. Form 50VS-1SI Pg 22 311 11-08 Replaces: New