Troubleshooting; Operating State - Sanyo SAP-KRV91EH Technical & Service Manual

10. TROUBLESHOOTING

Note before beginning inspection/repair
After checking the self-diagnostic monitor, disconnect the power plug before beginning inspection and
repair.
Since the outdoor unit controller (inverter) contains a large electrolytic capacitor, a potentially dangerous
charge (at a voltage of 280 VDC) remains even after breaker OFF. When the outdoor controller is operating
normally, it takes about 30 seconds to discharge. If trouble with the outdoor controller is suspected, leave it
for 5 minutes or more before handling.
After the inspection/repair, erase the contents of the self-diagnostic monitor by setting the operation selector
on the indoor unit to DEMO and then plugging back in the power supply.

10-1. Operating State

Customer Description
Dry Indoor fan sometimes stops.
operation
Indoor fan stops.
Indoor fan is not running at the set
Heating
fan speed.
mode
Moisture is rising.
Air flap is still running at start-up
and at operation stop.
It does not operate immediately
after being switched on.
It makes a strange sound.
Others
It smells during operation.
The speed of the indoor fan does
not change.
Air conditioner does not operate.
Based on the room temperature, the indoor fan and outdoor unit repeat the processes
of Operation and Stop.
When room temperature is below the set temperature, the indoor fan either slows
down to 1/f speed or stops.
Defrosting of the outdoor unit is occurring; indoor fan is halted to prevent cool drafts
from blowing in the room.
To maintain temperature in the room, rotation speed of the indoor fan is increased
according to the rise in indoor heat exchanger temperature.
During defrosting of the outdoor unit, steam may arise.
When operation is stopped during defrosting, the defrosting will continue. (Operation
automatically stops after defrosting.)
Flap motor positions the air flap by operating for 10 to 20 seconds after start-up and
operation stop.
When plugged in and operation button is pressed immediately, the outdoor unit will not
operate for about 3 minutes.
When restarted immediately after being stopped, the outdoor unit will not operate for
about 3 minutes.
Both are for preventing malfunctions.
You may hear sound similar to water flowing just after operation is started, during
operation, or after the system is stopped. This is the sound of refrigerant gas flowing
and is not a problem.
When operation is started or after it is stopped, you may hear some small sounds.
These are caused by switches or expansion / contraction of parts (heat exchanger /
plastic parts) inside the air conditioner due changes in temperature.
Smells permeating walls, carpets, furniture, or clothes may become noticeable.
If the recommended duration of use of the air clean filter (3 months) has elapsed, it
may smell. Replace the filter as soon as possible. (Replacement is sold separately.)
This during occurs cool draft prevention or when the room temperature has already
reached the set temperature. (Heating mode)
The room temperature already has reached the set temperature. (Dry operation)
If MODE selector button is pressed during the operation, it will operate with the very
low fan speed (LL) for about 3 minutes and after that, it will change to the set fan
speed.
Protective circuit may have engaged due to lightning. Disconnect the power plug for at
least 1 minute. Then reconnect the power plug and try operating the air conditioner. If
the air conditioner operates, it is not malfunctioning.
28
Explanation