Daikin LX10F11B Service Manual page 51

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002 F109 ・ E107 ・ E109
Alarm F109 LPT drops below -72 kPa within 2 seconds after compressor startup or E109 is generated
Logic 9 times
E109 LPT drops below -70 kPa for 2 seconds during operation.
E107 DCHS1or DCHS2 becomes 135℃ or more for 10 minutes or 145℃ or more.
Possible 1. LSV failure
Causes 2. EEV failure (Coil failure, valve not opening, valve clogging)
3. Liquid line----Clogging of filter, strainer or dryer.
4. Refrigerant shortage
5. LPT failure
Trouble Step 1. LSV check
Shooting 1.1 Check LSV coil resistance
1.2 Energize LSV coil and listen the sliding sound
("CLICK") of valve body after selected LSV
ON/OFF check （Refer to ※9 in paragraph 4.1
Manual Check.）
Step 2. EEV check
2.1 Disconnect the connector X9A (CPU board), then
check the resistance of EEV coil.
2.2 Touch on EEV coil vibration corresponding to
opening change when calibrating EEV at startup.
(Refer to paragraph 1.4.6 for calibration valves.)
2.3 Fully open the valve body using emergency
magnet. (Refer to paragraph 4.9.2.)
Then operate the unit without coil.
Step 3. Liquid line check
Check if there is a clogging in filter (front of LSV),
dryer, strainer (front of EEV).
If there is a clogging, the outlet side temperature of
dryer, filter or strainer is low.
Step 4. Check for refrigerant shortage and/or gas leak
Charge refrigerant R134a 0.5kg additionally two
times. Then, check if the low pressure changes
(increases) during operation.
Step 5. Check LPT.
(Refer to diagnosis No.
Controller F109 Unit stop
Action
E107 · E109 Restart after 3 minutes
019 .)
2-23
1.1 Coil resistance within 15.2±1.5Ω
1.2 If there is no sliding sound
("CLICK") of valve body, replace
LSV body.
2.1 Resistance between each coil:
46±3Ω
2.2 In case that the coil does not
vibrate corresponding to opening
change, check the coil or the
controller.
2.3 If the alarm is repeated, replace
EEV body.
3. If there is a clogging, repair as
needed.
Then, charge specified amount of
refrigerant.
4. It is refrigerant shortage if
there is change of low pressure
increasing. Stop refrigerant
additional charging and recover
refrigerant in system. Check
refrigerant leakages and then
charge specified amount of
refrigerant.