36 328 080000 01
Specifications subject to change without notice.
TROUBLESHOOTING
This section provides the required flow charts to troubleshoot problems
that may arise.
NOTE: Information required in the diagnoses can be found either
on the wiring diagrams or in the appendix.
Required Tools:
The following tools are needed when diagnosing the units:
S Digital multimeter
S Screw drivers (Phillips and straight head)
S Needle−nose pliers
Recommended Steps
1. Refer to the diagnostic hierarchy charts below and determine the
problem at hand.
2. Go to the chart listed in the diagnostic hierarchy and follow the
steps in the chart for the selected problem.
For the ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic display is on the outdoor unit board and is limited to very
few errors. The indoor diagnostic display is a combination of flashing
LEDs on the display panel on the front of the unit. If possible always
check the diagnostic codes displayed on the indoor unit first.
Problems may occur that are not covered by a diagnostic code, however
are covered by the diagnostic flow charts. These problems are typical
air conditioning mechanical or electrical issues that can be corrected
using standard air conditioning repair techniques.
For problems requiring measurements at the control boards note the
following:
1. Always disconnect the main power.
2. When possible check the outdoor board first.
3. Start by removing the outdoor unit top cover.
4. Reconnect the main power.
5. Probe the outdoor board inputs and outputs with a digital
multi−meter referring to the wiring diagrams.
6. Connect the red probe to the hot signal and the black probe to
the ground or negative.
7. Note that some of the DC voltage signals are pulse and give
continuously variable readings.
8. If it is necessary to check the indoor unit board you must start by
disconnecting the main power.
9. Remove the front cover of the unit and then the control box
cover.
10. Carefully remove the indoor board from the control box, place it
face up on a plastic surface. Ensure the surface is not metal.
11. Reconnect the main power and repeat steps 5., 6., and 7..
12. Disconnect the main power before reinstalling the board to avoid
a shock hazard and board damage.
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