Sanyo CG1411, KGS1411 service manual Caused by outdoor unit

12-8. Failure Display on Outdoor Unit and Correction Method

No.	Caused by (outdoor unit)	LED lamps				Meaning	Error Detected	Points to Diagnose	Correction Methods
		2	3	4	5
—	Normal	● ● ● ●				Normal operation	—	—	—
—	Defect in IC chip (E 2PROM)	● ● ● ●				Can not read IC chip data or miss-	Gas switching IC (EEP-ROM) data was not	● Confirm proper insertion of gas switching	➀ Replace gas switching IC chip
						ing IC chip on outside PCB	read properly by microcomputer upon	IC, then reset power supply	➁ Replace outdoor unit PCB
							power-on
—	Defective Gas Valves	● ● ● ●				Detect abnormality in Gas Valve	Electricity applied to GV1 / GV2 while gas	● Measure voltage of GV1 (WHT – WHT of I)	➀ Replace outdoor unit PCB
						Circuit at initial checking	valve is closed	and GV2 (ORG – ORG of I) (normal value:
								DC0V)
A	Defective Thermistor 1	● ● ● ●				Open or Short of Thermistor 1	Open / short circuit of Thermistor 1	● Measure resistance of Thermistor 1 (BLK –	➀ Check / modify Connector CN 15 (M)
								BLK of M.) (normal value: 6.6±0.5 kΩ at	➁ Replace Thermistor 1
								68°F (20°C))	➂ Replace outdoor unit PCB
B	Defective Thermistor 2	● ● ● ●				Open or Short of Thermistor 2	Open / short circuit of Thermistor 2	● Measure resistance of Thermistor 2 (BLK –	➀ Check / modify connector CN 16 (K)
								BLK of K.) (normal value: 6.6±0.5 kΩ at	➁ Replace Thermistor 2
								68°F (20°C))	➂ Replace outdoor unit PCB
C	Limit switch	● ● ● ●				Thermal fuse or Bimetal Thermostat	Temperature fuse / temperature limiting	● Check continuity of temperature fuse and	➀ Check / modify connector CN12 (P)
						tripped	switch operated	temperature limiting switch (YEL – YEL of	➁ Replace thermal fuse
								P) (normal value: 1Ω or less)	➂ Replace bimetal thermistor
D	Flame Current Circuit	● ● ● ●				Abnormality in Flame Current	Flame current detected while combination	● Measure electric current between BLK of	➀ Replace flame sensor probe (CN17)
						Circuit	gas valve is closed	flame rod and CN17(J) on the PCB (nor-	➁ Replace outdoor unit PCB
								mal value: 0 µA, combination gas valve
E	Lighting failure	● ● ● ●				Could not establish flame	Fail to ignite by ignition operation (including	closed)	➀ Check / modify connector CN17 (J)
							retry)	● Measure electric current between BLK of	➁ Check / modify connector CN7 (G)
								flame rod and CN17(J) on the PCB (nor-	➂ Replace ignition electrode
								mal value: 3 µA or more at ignition)	➃ Check / modify insertion of wire on secondary
								● Check positioning of ignition plug, flame	side of ignition transformer
								rod and burner (normal: electric discharge	➄ Replace flame rod
								gap approx. 4mm)	➅ Replace ignition transformer
								● Confirm sparking noise at the igniter	➆ Replace outdoor unit PCB or power transformer
F	Lost flame	● ● ● ●				Flame Sensor Circuit detects lost	Extinction after flame detection, and does		As above
						flame and could not establish the	not re-try (burning after re-try, yet extin-	As above
						flame	guishes within 4 minutes)
G	Incorrect combustion motor speed	● ● ● ●				Incorrect combustion motor speed	Inadequate revolution speed		➀ Check / modify connector CN5 (D)
							➀ At ignition:	● Check revolution of combustion blower fan	➁ Check / modify connector CN14 (N)
							Does not reach 500rpm within 20 sec-	● Measure voltage of combustion blower	➂ Replace combustion blower fan motor set
							onds	motor (PLE – PLE of D) (normal value: AC	➃ Replace outdoor unit PCB
							Reaches 500rpm within 20 seconds yet	30 – 115 V)
							does not reach prescribed revolutions
							(approx. 1,850rpm) within 60 seconds
							➁ Less than 500rpm (other than ignition)
H	Over-time period in retry	● ● ● ●				Thermistor 1 or Thermistor 2 tem-			➀ Repair refrigerant tubes (connections, etc.)
						perature did not go down during set	Thermistor 1 and/or Thermistor 2 do not	● Check for refrigerant leaks (pressure in	(leaks)
						period	cool down to normal temperature within 10	wide tube while cooling operation: approx.	➁ Charge additional refrigerant (leaks)
							minutes after being heated up to a speci-	85.0 PSIG (6 kgf/cm2)	➂ Replace units
							fied temperature (gas is cut off when over-
I	Over number of times in retry	● ● ● ●				Combustion stopped by Thermistor	heating)		As above
						1 or Thermistor 2 more than set	Fourth overheating is detected. Retry is	As above
						number	performed up to 3 times when Thermistor 1
							and / or Thermistor 2 cool down to normal
J	Bypass Valve (V2) not open	● ● ● ●				Bypass Valve failure or drop-out of	temperature within 10 minutes		➀ Confirm / modify position of Thermistor 2
						Thermistor 2	Thermistor 2 does not detect temperature	● Check position of Thermistor 2.	➁ Confirm / modify connector CN6 (F)
							increase (approx. xx°F (2°C)) within 30 sec-	● Measure voltage at ON/OFF valve (RV2)	➂ Replace ON/OFF valve 2 (coil)
							onds after ON/OFF valve (RV2) is ON	(BLK – BLK of F) (normal value: AC 104 –	➃ Replace outdoor unit PCB
								126 V, ON)	➄ Replace units
—	Reversing Valve not working	● ● ● ●				Reversing Valve failure, drop-out of			➀ Repair refrigerant tubes (connections, etc.)
						Thermistor 2, or shortage of refrig-	Thermistor 1 fails to detect temperature	● Check for refrigerant leakage	(leaks)
						erant	increase (approx. xx°F (1°C)) within 30 sec-	● Check position of Thermistor 1	➁ Charge additional refrigerant (leaks)
							onds after ON/OFF valve (V1) is open at	● Measure voltage at reversing valve (BLK –	➂ Check / modify position of Thermistor 1
							ignition operation	BLK of B) (normal value: AC 104 – 126 V,	➃ Check / modify connector CN03 (B)
								ON)	➄ Replace reversing valve (coil)
									➅ Replace outdoor unit PCB
Note:	Failure display remains even after power reset following repairs. The display is overridden upon operation of compressor when heating operation is carried out for a second time after the repair.

64