5-1 - R4.5 Fridge not Cooling

Modified on Tue, 3 Jun at 11:37 PM

According to the problem analysis result done by TSA, you can directly begin the subsequent troubleshooting process from the corresponding potential root cause.

1. Parameters

5-1-1-1 - Check if the parameter settings are correct.

General Parameters: Press the “Set” button for 3 seconds. The general parameters will appear after the display flashes “888” 3 times.	Lock Parameters: Press the “Set” button for 3 seconds, then press the ?? button together during the display flashing “888”, and the lock parameters will appear.
tS: 1	Loc: no
td: 3	tHS: 1
Sd: 1	tLS: -2
di: 3	AtH: 60
dd: 14	Ad: 30
dS: 20	AtL: -50
	Fc: Sto
	Fd: 1
	FS: 20
	tA: 0
	SEr: 0
	ALr: 0

Use the “??” button to select the parameter code
Press the “Set” button to enter the parameter setting
Use the “??” button to select the value
Press the “Set” button to set the parameter.

Result 1 - All settings are correct.
Start 5-1-2-1.
Result 2 - There is the deviation between actual settings and standard values in the table.
Start 5-1-1-2.

5-1-1-2 - Correct the deviated parameter, wait for 30 minutes, and verify the fridge cooling capability.

Result 1 - The temperature drops to 1 - 4°C.
Issue close. (Root cause: Wrong parameter setting)
Result 2 - Temperature is still not dropping.
Start 5-1-2-1.

2. Airflow Cycling

5-1-2-1 - Verify if the compressor is cycling.

Result 1 - It's cycling.
Start 5-1-2-2.
Result 2 - It's not cycling.
Escalate to TSA for machine swap.

5-1-2-2 - Verify if the fridge storage is warmer than the ambient temperature.

Result 1 - Warmer than the ambient temperature.
Start 5-1-3-1.
(ONLY licensed technicians can start 5-1-3-1, escalate to FAE if you’re not licensed.)
Result 2 - Cooler but the temperature is not in between 1 - 4°C.
Start 5-1-3-3.

5-1-2-3 - Verify if the condenser inlet is covered by dust.

Result 1 - Covered by the dust.
Start 5-1-2-4.
Result 2 - Not covered by the dust.
Start 5-1-3-1.
(ONLY licensed technicians can start 5-1-3-1, escalate to FAE if you’re not licensed.)

5-1-2-4 - Clean the dust, and verify if the fridge temperature drops to 4°C in one hour.

Result 1 - The fridge temperature drops to 4°C in one hour.
Issue closed. (Root cause: Condenser airflow is blocked)
Result 2 - Still warm (not cool enough).
Start 5-1-2-5.

5-1-2-5 - Verify if all the fans are working.

Result 1 - Malfunctioning fan(s) is(are) found.
Start 5-1-2-6.
Result 2 - All fans are working fine.
Start 5-1-3-1.
(ONLY licensed technicians can start 5-1-3-1, escalate to FAE if you’re not licensed.)

5-1-2-6 - Reconnect the malfunctioning fan wire (or replace the fan if the fan fails) to recover the airflow. Verify if the fridge temperature drops to 4°C in one hour.

Result 1 - The fridge temperature drops to 4°C in one hour.
Issue closed. (Root cause: Fan failure)
Result 2 - Still warm (not cool enough).
Start 5-1-3-1.
(ONLY licensed technicians can start 5-1-3-1, escalate to FAE if you’re not licensed.)

3. Refrigerant Leakage

5-1-3-1 - Remove the fill cap, and verify if the cap seems oily or dirty

Result 1 - The fill cap is oily or dirty.
Start 5-1-3-2.
Result 2 - The fill cap is fine.
Start 5-1-3-3.

5-1-3-2 - Clean (replace) the fill cap, then start 5-1-2-5.

5-1-3-3 - Verify if there is any stain on the compressor / copper tube.

Result 1 - Stain is found.
Start 5-1-3-4.
Result 2 - Stain is not found.
Start 5-1-3-5.

5-1-3-4 - Cleaning and solder the stain position, then start 5-1-3-5.

5-1-3-5 - Follow the SOP to refill the refrigerant and verify the fridge cooling capability.

Result 1 - The temperature drops to 4°C.
Issue closed. (Root cause: Refrigerants leaking)
Result 2 - Temperature is still not dropping.
Escalate to FAE.

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