Sanyo CG1411 User Manual download pdf (Page 68)

100

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

PROM) ●● ●● ●● ●

— Defective Gas Valves ●● ●● ● ●●

A Defective Thermistor 1 ●● ●● ●●

B Defective Thermistor 2 ●● ● ●● ●●

C Limit switch ●● ● ●● ●

D Flame Current Circuit ●● ●●●●

E Lighting failure ●● ●●●

F Lost flame ● ●● ●● ●●

G Incorrect combustion motor speed ● ●● ●● ●

H Over-time period in retry ● ●● ● ●●

I Over number of times in retry ● ●● ●●

J Bypass Valve (V2) not open ●●●● ●●

— Reversing Valve not working ●●●● ●

Gas switching IC (EEP-ROM) data was not

read properly by microcomputer upon

power-on

Electricity applied to GV1 / GV2 while gas

valve is closed

Open / short circuit of Thermistor 1

Open / short circuit of Thermistor 2

Temperature fuse / temperature limiting

switch operated

Flame current detected while combination

gas valve is closed

Fail to ignite by ignition operation (including

retry)

Extinction after flame detection, and does

not re-try (burning after re-try, yet extin-

guishes within 4 minutes)

Inadequate revolution speed

➀ At ignition:

Does not reach 500rpm within 20 sec-

onds

Reaches 500rpm within 20 seconds yet

does not reach prescribed revolutions

(approx. 1,850rpm) within 60 seconds

➁ Less than 500rpm (other than ignition)

Thermistor 1 and/or Thermistor 2 do not

cool down to normal temperature within 10

minutes after being heated up to a speci-

fied temperature (gas is cut off when over-

heating)

Fourth overheating is detected. Retry is

performed up to 3 times when Thermistor 1

and / or Thermistor 2 cool down to normal

temperature within 10 minutes

Thermistor 2 does not detect temperature

increase (approx. xx°F (2°C)) within 30 sec-

onds after ON/OFF valve (RV2) is ON

Thermistor 1 fails to detect temperature

increase (approx. xx°F (1°C)) within 30 sec-

onds after ON/OFF valve (V1) is open at

ignition operation

Can not read IC chip data or miss-

ing IC chip on outside PCB

Detect abnormality in Gas Valve

Circuit at initial checking

Open or Short of Thermistor 1

Open or Short of Thermistor 2

Thermal fuse or Bimetal Thermostat

tripped

Abnormality in Flame Current

Circuit

Could not establish flame

Flame Sensor Circuit detects lost

flame and could not establish the

flame

Incorrect combustion motor speed

Thermistor 1 or Thermistor 2 tem-

perature did not go down during set

period

Combustion stopped by Thermistor

1 or Thermistor 2 more than set

number

Bypass Valve failure or drop-out of

Thermistor 2

Reversing Valve failure, drop-out of

Thermistor 2, or shortage of refrig-

erant

● Confirm proper insertion of gas switching

IC, then reset power supply

● Measure voltage of GV1 (WHT – WHT of I)

and GV2 (ORG – ORG of I) (normal value:

DC0V)

● Measure resistance of Thermistor 1 (BLK –

BLK of M.) (normal value: 6.6±0.5 kΩ at

68°F (20°C))

● Measure resistance of Thermistor 2 (BLK –

BLK of K.) (normal value: 6.6±0.5 kΩ at

68°F (20°C))

● Check continuity of temperature fuse and

temperature limiting switch (YEL – YEL of

P) (normal value: 1Ω or less)

● Measure electric current between BLK of

flame rod and CN17(J) on the PCB (nor-

mal value: 0 µA, combination gas valve

closed)

● Measure electric current between BLK of

flame rod and CN17(J) on the PCB (nor-

mal value: 3 µA or more at ignition)

● Check positioning of ignition plug, flame

rod and burner (normal: electric discharge

gap approx. 4mm)

● Confirm sparking noise at the igniter

As above

● Check revolution of combustion blower fan

● Measure voltage of combustion blower

motor (PLE – PLE of D) (normal value: AC

30 – 115 V)

● Check for refrigerant leaks (pressure in

wide tube while cooling operation: approx.

85.0 PSIG (6 kgf/cm

)

As above

● Check position of Thermistor 2.

● Measure voltage at ON/OFF valve (RV2)

(BLK – BLK of F) (normal value: AC 104 –

126 V, ON)

● Check for refrigerant leakage

● Check position of Thermistor 1

● Measure voltage at reversing valve (BLK –

BLK of B) (normal value: AC 104 – 126 V,

ON)

➀ Replace gas switching IC chip

➁ Replace outdoor unit PCB

➀ Replace outdoor unit PCB

➀ Check / modify Connector CN 15 (M)

➁ Replace Thermistor 1

➂ Replace outdoor unit PCB

➀ Check / modify connector CN 16 (K)

➁ Replace Thermistor 2

➂ Replace outdoor unit PCB

➀ Check / modify connector CN12 (P)

➁ Replace thermal fuse

➂ Replace bimetal thermistor

➀ Replace flame sensor probe (CN17)

➁ Replace outdoor unit PCB

➀ Check / modify connector CN17 (J)

➁ Check / modify connector CN7 (G)

➂ Replace ignition electrode

➃ Check / modify insertion of wire on secondary

side of ignition transformer

➄ Replace flame rod

➅ Replace ignition transformer

➆

Replace outdoor unit PCB or power transformer

As above

➀ Check / modify connector CN5 (D)

➁ Check / modify connector CN14 (N)

➂ Replace combustion blower fan motor set

➃ Replace outdoor unit PCB

➀ Repair refrigerant tubes (connections, etc.)

(leaks)

➁ Charge additional refrigerant (leaks)

➂ Replace units

As above

➀ Confirm / modify position of Thermistor 2

➁ Confirm / modify connector CN6 (F)

➂ Replace ON/OFF valve 2 (coil)

➃ Replace outdoor unit PCB

➄ Replace units

➀ Repair refrigerant tubes (connections, etc.)

(leaks)

➁ Charge additional refrigerant (leaks)

➂ Check / modify position of Thermistor 1

➃ Check / modify connector CN03 (B)

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.

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Sanyo CG1411 User Manual Page 68

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