1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
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1<br />
12<br />
3<br />
4<br />
5<br />
(B) Heating<br />
b. Heating<br />
Poor heating<br />
Cold air is<br />
discharged.<br />
Cold draft prevention<br />
is not working.<br />
Refrigerant flow<br />
failure<br />
Not enough<br />
air circulation<br />
Is setting temp.<br />
suitable ?<br />
Is heating load<br />
too large ?<br />
4-way valve is<br />
defective.<br />
Refrigerant<br />
shortage<br />
Electronic refrigerant<br />
control valve is defective.<br />
Compressor is defective.<br />
Service valves are not<br />
fully open.<br />
Air filter<br />
is clogged.<br />
Is fan speed<br />
set to LOW ?<br />
Refrigerant tubes between<br />
indoor and outdoor units<br />
are not insulated.<br />
4-way valve is<br />
defective.<br />
“ STANDBY ” is<br />
displayed.<br />
Indoor coil sensor E2 is<br />
defective.<br />
IV - 6<br />
4. Service procedures<br />
Change the setting temp.<br />
Review heating load<br />
estimate.<br />
Replace the valve.<br />
Charge with<br />
refrigerant.<br />
Replace the valve.<br />
Replace the compressor.<br />
Open the valves fully.<br />
Clean the filter.<br />
Set the fan speed to<br />
either MEDIUM or HIGH.<br />
Insulate wide and narrow<br />
tubes separately.<br />
Replace the valve.<br />
Replace indoor<br />
P.C.B. Ass'y.<br />
Replace the sensor.<br />
0459_M_I
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