Air Conditioner Operates, But Abnormalities Are Observed - Sanyo SA-123AH Technical & Service Manual

7-4. Air conditioner operates, but abnormalities are observed.

7-4-1. Operation does not switch from HEAT to COOL (or COOL to HEAT)
• Measure resistance of 4–way valve's
winding.
7-4-2. Poor cooling or heating
• Measure temperature of suction and
discharge air of air conditioner.
Check for clogging of air filter.
• Fan speed is set to LOW.
• Review cooling load estimate,
if performance of air conditioner is
normal.
7-4-3. Excessive cooling or heating
• Set temperature is suitable.
Temperature
difference
is small.
Temperature difference between
suction and discharge air is
large enough (approx. 10 deg. or more).
Air filter is clogged.
YES
NO
Possibility of
gas shortage.
Clean filter.
Set fan speed to
HIGH.
Reduce cooling or heating
load or replace the air
conditioner with larger
capacity.
Set temperature to higher or
lower value using thermostat
on the control panel.
16
Charge refrigerant
gas (R22).