Technical Service Bulletin - Panasonic

C. There might be an error code. Use the remote to put the unit into self diagnostic
mode and retrieve the error code. The procedure is explained on the back of the
indoor unit’s cover. It is also in the service manual which can be down loaded at our
web site.
D. If there are communication codes, disconnect the field wire at terminal 3 of the
indoor unit and check for 22-26 volts DC between terminal 3 and 2 (not the wire
and 2). If there is no voltage, replace the indoor board. If the voltage checks good
connect the wire back up and proceed to the next step.
E. Disconnect the wire at the number 3 terminal of the outdoor unit and check for the
same voltage between the wire and terminal 2 of the outdoor unit. Note that if this
is a flexi model it might not be labeled as terminal 3 but, it is the third wire going
to the indoor unit you are troubleshooting. If the voltage checks the same, the
outdoor board is causing the problem. If the voltage is higher, or lower, replace the
interconnecting (14/3 with ground) field wiring.
Section 5: Other Items for Troubleshooting
If the indoor unit is running (the outdoor is off), has a steady green light, and will
not cool. It is most likely locked out on low ambient temperatures. Some models can
be made low ambient using a SANYO Low Ambient Kit containing a board and crank
case heater. NO after market controls will work.
Check your supply voltage with load and no load.
If you are having intermittent problems, verify the power supply is not pulled from
a 3 phase panel. In most cases this does not cause problems but commercial power
supplies could be prone to electrical noises and cause interference issues.
Check for voltage on the ground wire of your power supply. Ground to earth ground.
Verify the 3 wires that go from the board to 1, 2 and 3 are landed properly if
board/boards have been changed. These models are polarity sensitive.
If an outdoor board has been changed, verify that ALL the screws that hold the
board down are in place and tight before running.
Ohm the crank case heater, it should read between 700-1500. This heater can
short out the circuit board.
For additional details please access our technical literature using our website at
http://us.sanyo.com/HVAC or contact our technical service department.
2009.10.02 Ductless Split Diagnostic Procedures for systems of 24k/BTU and less 4