37
8-504.11
TROUBLESHOOTING
Troubleshooting – Indoor Unit (cont.)
Trouble Possible Cause Possible Remedy
D. No Cooling (cont.)
6. Indoor coil temperature too low.
6. Check refrigerant charge by measuring operating
pressures. Check lters condition. (See page 32 for
lter removal and cleaning instructions)
7. Sensor failure. (Microprocessor units only -
Digit 8 = M)
7. If any of the sensors are faulty the microprocessor will
disable the cooling operation.
8. Outdoor unit tripped.
8. Check outdoor unit - refer to outdoor unit troubleshooting
section.
9. Faulty valve actuator. (Chilled water units only –
Digit 2,3=CW)
9. Check cooling signal present at actuator. Check actuator
by manually opening the valve. Replace actuator if
necessary.
E. Water Leaking From
Unit
(see also“Condensate
High Level”)
1. Condensate plug loose or missing.
1. Check that the rubber condensate plug is securely tted
to the underside of the unit’s polystyrene drip tray. On
some models this is located underneath the fascia
support rails on the pump side of the unit.
2. Unit installed unevenly.
2. With fascia removed, ensure that the unit chassis is level
(at the face) both front to back and left to right, to ensure
correct condensate ow.
3. Condensate drain piping installed incorrectly.
3. Check that the site installed condensate gravity drain
slopes ‘downhill’ away from the unit. (See page 9 of
this manual for condensate piping installation guide)
4. Blocked/kinked condensate pipe.
4. Check condensate piping for blocks/kinks, clear as
necessary. Check for a water tight connection between
the condensate outlet and the site installed condensate
gravity drain.
5. Condensate pump blocked or failed.
5. Clear any blockages and ensure that power is being
applied to the pump. If the pump still does not run,
replace the pump.
6. Float switch failure.
6. Check that the oat switch operates correctly and is
properly positioned. Float switch is normally closed,
opens on rise of water level.
F. Condensate High
Level
(microprocessor
units: LED’s will
ash)
1. Maximum pump lift exceeded.
1. Check that the condensate pump head is no greater than
30”. (See page 9 of this manual for condensate piping
installation guide)
2. Blocked/kinked condensate pipe.
2. See section "E. Water Leaking From Unit
(see also“Condensate
High Level”)"
3. Condensate pump blocked or failed.
3. See section "E. Water Leaking From Unit
(see also“Condensate
High Level”)"
4. Coil freeze up.
4. A coil freeze condition may have caused excessive
condensate to collect in the drip tray. See section "G. Coil
Freeze".
G. Coil Freeze
1. Cooling coil freeze protection thermostat tripped.
(Auto-reset when freeze cleared)
1. Freeze stat is normally closed, opens during freeze.
Where tted, the stat will disable the cooling action
(sometimes the entire system) during coil freeze
conditions. Use the unit’s wiring schematic to investigate.
2. Dirty or blocked air lter.
2. Clean / replace lters as necessary. (See page 32 for
lter removal and cleaning instructions)
3. System head pressure set too low.
3. Check condensing pressure, installation of low ambient
kit may be required.
4. Loss of refrigerant.
4. Check system for refrigerant leaks and repair before
re-charging.
To Next Page
Loading...