Question about Mitsubishi MSH09TW Air Conditioner
After a power outage while 2 of 3 inside units were in "cool" mode, each "cool" unit's left indicator light blinks and the right is off, the unit fan runs, but no cooling is provided. This pattern of indicator lights is not in the Operating Instructions. Resolution: The outside unit was not running. I flipped the outside unit breaker off, waited 30 seconds and turned it on; both "cool" inside units continued as before, not cooling. Started the third inside unit in "cool" and it operated correctly, cooling; turned it off. Flipped inside unit breaker off, waited ca. 1 min. and turned breaker on; both "cool" inside unit lights then displayed correctly and both operated correctly, cooling.
The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!
Posted on Sep 04, 2007
Tips for a great answer:
E5 indicates excessive temp. of the outside coil if on cooling, OR excessive temp of the inside coil in
heat mode. On cooling, the E5 will appear if the outside coil temp exceeds 68C. This is an indication
of condenser airflow reduced or non-existent. Using the procedure described above it is possible to
watch the condenser coil temp using the Temp down button and Medium fan speed combination to
display this temp. NB: if fans etc seem to be OK then measure thermistor resistance and refer to table
12. In case the problem is thermistor calibration.
Action: If unit is in cooling mode, examine both condenser fans are running. If
one is running then suspect a faulty motor. If both fans not running then
on units up to serial No. IBSA 01175, investigate the fan speed control
card located in enclosure on the LHS See fig 6.
If this checks OK then investigate main control card.
Fig 1, 2 or 3. Units with serial No's IBSA01176 and
onward are multi speed tapped wound motors not requiring a speed
control card. If both motors inoperative then suspect main control card
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