Toshiba RAV-SM304MUT-E Service Manual page 50

Check
code
Cause of operation
Indoor
unit
H03 Current detection circuit error
Open phase of 3-phase power supply
P05
F23 Ps sensor error
Low pressure protective operation
H06
Discharge temp. error
P03 ∗ Discharge temp. (TD) over specified value
was detected.(1.6)
Case thermostat operation
H04
∗ Abnormal overheat of compressor
P04 High pressure SW system error
P05 Power supply voltage error
High pressure protective operation
• During cooling operation, outdoor temp.
sensor (TL) detected temperature over
P20
specified temp.
• During heating operation, indoor temp.
sensor (TC, TCJ) detected temperature over
specified temp.
P22 Outdoor fan system error
Short-circuit error of compressor driving
P26
element
P29 Position detection circuit error
AMP Air Conditioning
Operation of diagnostic function
Status of
air conditioner
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Condition
Displayed when 1. Check outdoor P .C. board (MCC-1596).
error is detected (AC current detection circuit)
1. Check open phase of 3-phase power supply.
Displayed when
2. Black lead wire to be connected to CN03 of MCC-1596
error is detected
does not pass through T611.
1. Check connection of Ps sensor connector.
2. Check failure of Ps sensor.
Displayed when
3. Check compressing power error of compressor.
error is detected
4. Check 4-way valve error.
5. Check outdoor P .C. board error.
1. Check service valves are fully opened.
(Gas side, Liquid side)
2. Check clogging of outdoor PMV. (PMV1, 2)
3. Check SV2 circuit.
Displayed when
4. Check Ps sensor error.
error is detected
5. Check clogging of indoor filter.
6. Check clogging of refrigerant pipe.
7. Check of outdoor fan operation. (In heating mode)
8. Check short of refrigerant.
1. Check refrigerating cycle (Gas leak)
Displayed when
2. Trouble of electronic expansion valve
error is detected
3. Check discharge temp. sensor (TD).
1. Check case thermostat and connector.
2. Check gas leak, recharge
Displayed when
3. Check full open of service valve.
error is detected
4. Check PMV (Pulse Motor Valve).
5. Check broken pipe.
1. Check service valves are fully opened.
(Gas side, Liquid side)
2. Check of outdoor fan operation.
3. Check motor error of outdoor fan.
4. Check clogging of outdoor PMV. (PMV1, 2)
Displayed when
5. Check clogging of heat exchanger in indoor/outdoor units.
error is detected
6. Short-circuit status of suction/discharge air in outdoor unit.
7. Check outdoor P .C. board error.
8. Check fan system error (Cause of air volume drop) at
indoor side.
9. Check PMV opening status in indoor unit.
Displayed when 1. Check power supply voltage.
error is detected
1. Check outdoor heat exchanger sensor (TL).
2. Check indoor heat exchanger sensor (TC, TCJ).
3. Check full open of service valve.
Displayed when 4. Check indoor/outdoor fan.
error is detected
5. Check PMV (Pulse Motor Valve).
6. Check clogging and short circuit of indoor/outdoor heat
exchanger.
7. Overcharge of refrigerant. Recharge
1. Check lock of fan motor.
Displayed when
2. Check power supply voltage between L2 and N.
error is detected
3. Check outdoor P .C. board.
1. When performing operation while taking-off compressor
wire, P26 error occurs. Check control P .C. board.
Displayed when
error is detected 2. When performing operation while taking-off compressor
wire, an error does not occur. (Compressor rare short)
Displayed when 1. Check control P .C. board.
error is detected
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Judgment and measures