To Next Page

To Previous Page

TROUBLESHOOTING

IMPORTANT: The follo wing Troubleshooting tables are designed to help identify possible causes and solutions for problems. There

could be more than one cause/solution to a problem that can be applied. Check each cause and adopt ”process of elimination”

and/or verification of each before making a conclusion.

Tables 14 and 15 show the status codes flashed by the amber status

light. The codes are flashed by a series of short and long flashes of

the status light. The short flashes indicate the first digit in the

status code followed by long flashes indicating the second digit of

the error code. The short flash is 0.25 seconds on and the long

flash is 1.0 seconds on. Time between flashes is 0.25 seconds.

Time between short flash and first long flash is 1.0 seconds. Time

between code repeating is 2.5 seconds with LED off.

Table 14 – UPM Fault Code Table

OPERATION FAULT FLASH CODE POSSIBLE CAUSE AND ACTION

Standby 18---30 VAC power is present ON, no flash Normal Operation

Low Stage 1, pause Normal Operation

High Stage 2, pause Normal Operation

Brownout Protection is Disabled 5, pause User made selection, see instructions for details

Brownout Protection is Active 6, pause Default, user can disable see instructions for details

System Communication Failure 16

Communication with User Interface lost. Check wiring

to and from User Interface

Invalid Model Plug 25

Control does not detect a model plug or detects an

invalid model plug. Unit will not operate without cor-

rect model plug.

High Pressure Switch 31*

High Pressure Switch T rip. Check Refrigerant

Charge, Water Flow and Temperature too h igh in

cooling, and airflow restrictions in heating.

Low Pressure Switch 32*

Low Pressure Switch T rip. Check Refrigerant Charge,

TXV operation and airflow restrictions.

Internal Board Failure 45

UPM board has failed. Replace Board and transfer

model plug to replacement board.

Brownout on 230V 46

Line vol tage <170V for at least 4 seconds. Compres-

sor and blower not allowed until voltage >173V. Veri-

fy line voltage. This feature can be disabled, see in-

structions for details.

No 230V to unit 47

There is no 230V at the contactor when indoor unit is

powered and cooling/heating demand exists. Verify

the disconnect is closed a nd 230V wiring is connect-

ed to the unit.

Freeze Sensor Fault 57

Freeze sensor is invalid or out of range.. Check for

open sensor, wire disconnected, sensor not connect-

ed properly or abnormal sensor temp ranges.

Compressor Thermal Cutout

in Low Stage

71*

Compressor operation detected then disappears

while low stage demand exist. Possible causes are

internal compressor overload trip or start relay and

capacitor held in circuit too long (if installed).

Compressor Thermal Cutout

in High Stage

72*

Compressor operation detected then disappears

while high stage demand exist. Possible causes are

internal compressor overload trip or start relay and

capacitor held in circuit too long (if installed).

Voltage at Standby

(contactor shorted)

Compressor voltage sensed when no demand for

compressor operation exists. Contactor may be

stuck closed or there is a wiring error.

No Voltage to Compressor

(No voltage at start---up)

Compressor voltage not sensed when compressor

should be starting. Contactor may be stuck open or

there may be a wiring error.

Thermal Lockout in Low Stage

for 4 Hours

Thermal cutout occurs in 3 consecutive low/high

stage cycles. Low stage locked out for 4 hours or

until 24V power recycled.

Thermal Lockout in High Stage

for 4 Hours

Thermal cutout occurs in 3 consecutive high/low

stage cycles. High stage locked out for 4 hours or

until 24V power recycled.

Low Pressure Lockout 83

Low Pressure Switch (LPS) trips 2 or 4 times in an

hour. Unit operation is locked out for 4 h ours or until

24V power recycled.

High Pressure Lockout 84

High Pressure Switch (HPS) trips 2 or 4 times in an

hour. Unit operation is locked out for 4 h ours or until

24V power recycled.

Condensate Overflow 85

Waterinthecondensatepanexceedscertainlevel.

The compressor is re ---ener gized when water issue

clears.

Freeze Sensor Lockout 86

Refrigerant temperature drops below or remains at

freeze limit trip for 30 seconds, the unit enters into a

permanent lockout an d needs a manual reset. Water

coil freeze sensor below limit, verify proper loop wa-

ter temp and pressures. Verify sensor accuracy us-

ing tables in instructions and verifying it is properly

attached to coil. Verify antifreeze quantity if applica-

ble and the freeze protection limit dip switch settings

appropriate on the UPM board.

*Sequence: Compressor contactor is de---energized. If demand still exists, control will energize compressor contactor after 15 minute delay. If fault is

cleared, unit will resume operation. If fault exists, blower shuts off, and error code continues to flash. Control will attempt re---start every 15 minutes. Cycling

low voltage defeats the 15 minute delay.