Panasonic 2WAY Multi - H07 Compressor Oil Depletion Error (for Only W MULTI

IV–66
H07 Compressor Oil Depletion Error (for only W MULTI)
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Error detection method
Each outdoor unit is inspected for lack of oil and when the oil level is 0 (insuffi cient) for 20 minutes, the engine
stops.
• An H07 failure is assumed when the engine has stopped due to insuffi cient oil a total of 8 times.
• This cumulative count clears when the oil level becomes 1 (normal) or 2 (suffi cient).
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Troubleshooting
1
Gas shut-off
valve check
1-1
Is the cooler being operated when the outside temperature
is 5°C or less (or is there any evidence of this)? (If there
is only one outdoor unit, this is “No” regardless of outside
temperature.)
Yes 1-2
No 2-1
1-2 Is the gas shut-off valve (optional) correctly connected?
Yes 2-1
No
Connect the gas shut-off
valve
2
Sensor
2-1
Is the temperature sensor for measuring the oil level
correctly installed? (Must be no disconnected or fl oating
sensors.)
Yes 2-2
No
Resecure the
temperature sensor in
place
2-2
Are the characteristics of the temperature sensor for
measuring the oil level normal? (Temperature sensor:
Check the TH11 resistance value.)
Yes 2-3
No
Replace the temperature
sensor
2-3
Are the measurement results of the temperature sensor
for measuring the oil level valid?
* Compare the No. 26 value displayed on [No.00] on the
outdoor unit’s main board (temperature measurement for
the oil level) with the actual temperature measured with a
thermometer or other tools.
Yes 3 -1
No
Replace the outdoor
unit’s main board
3
Regular oil
return circuit
check
3-1
Operate the outdoor unit and check the temperature of the
regular oil return circuit. Is the temperature rising?
* Check the temperature at the top of the capillary on the
oil return circuit (near the temperature sensor for the oil
level) directly with a thermometer or other tools, or check
the fl uctuations in temperature displayed for the oil level
on the outdoor unit’s main board.
* Although results will differ in accordance with conditions,
the temperature will clearly rise approximately 5 to 10
minutes after the engine has been started up under
normal circumstances.
Yes 4-1
No
Replace the regular oil
return circuit
4
Dry core check 4-1
Is the dry coil blocked?
* Operate the heater and check the temperature
differences at the dry core’s inlet and outlet.
Yes 5 -1
No Replace
5
Suction strainer
check
5-1
Is the suction strainer blocked?
(It is especially important to check this on renewal-
dedicated units.)
Yes 6 -1
No Replace
6
Compressor oil
replenishment
6-1 Replenish 4 L of compressor oil (for the entire system) and keep an eye on the situation.
Note: The solenoid valve coils and the vicinity can become very hot so check operations should be performed
with care.
GHPtroubleshooting.indbIV‒66GHPtroubleshooting.indbIV‒66 2012/11/2611:20:112012/11/2611:20:11