12-3-2. Thermistor Abnormality (Indoor Unit Only)

Check open / short circuit at the coil thermistor and room thermistor (between 1 and 2 of the lamp 8P) on the PCB of the indoor unit (but only when the room temperature is 14 to 113°F).

12-3-3. Protective Circuit of Outdoor (Burner) Unit Operated

Check the following according to the failure display. Check items listed in 12-6. Heating Operation Not Possible.

light off

light on

No.

Caused by (outdoor unit)

LED lamps

Meaning

2

3

4

5

 

 

 

Normal

● ● ● ●

Normal operation

 

 

 

 

Defective in IC chip (E 2PROM)

● ● ● ●

Cannot read IC chip data or missing IC chip on outside

 

 

 

 

 

 

PCB

 

 

 

 

Defective Gas Valves

● ● ● ●

Detects abnormality in Gas Valve Circuit at initial

 

 

 

 

 

 

checking

A

Detective Thermistor 1

● ● ● ●

Open or Short of Thermistor 1

 

 

 

 

B

Detective Thermistor 2

● ● ● ●

Open or Short of Thermistor 2

 

 

 

 

C

Limit switch

● ● ● ●

Thermal fuse or Bimetal Thermostat tripped

 

 

 

 

D

Flame current circuit

● ● ● ●

Defective abnormal in Flame Current Circuit

 

 

 

 

E

Lighting failure

● ● ● ●

Couldn’t establish flame

 

 

 

 

F

Lost flame

● ● ● ●

Flame Sensor Circuit detects lost flame and could not

 

 

 

 

 

 

establish the flame

 

 

 

 

G

Incorrect combustion motor speed

● ● ● ●

Incorrect combustion motor speed

 

 

 

 

H

Over-time period in retry

● ● ● ●

Thermistor 1 or Thermistor 2 temperature did not go

 

 

 

 

 

 

down in set period

 

 

 

 

I

Over number of times in retry

● ● ● ●

Combustion stopped by Thermistor 1 or Thermistor 2

 

 

 

 

 

 

more than set number

 

 

 

 

J

Bypass Valve (V2) not open

● ● ● ●

Bypass Valve failure or drop-out of Thermistor 2

 

 

 

 

Reversing Valve not working

● ● ● ●

Reversing Valve failure, drop-out of Thermistor 2, or

 

 

 

 

 

 

shortage of refrigerant

 

 

 

 

 

 

 

Note: Refer to 12-8. Failure Display on Outdoor Unit and Correction Method.

12-3-4. CT Detection (Refer to 12-3-9 and 12-3-10.)

(1)Compressor abnormality

(2)Compressor over-load relay engaged

55

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Image 59
Sanyo KGS1411, CG1411 Thermistor Abnormality Indoor Unit Only, Protective Circuit of Outdoor Burner Unit Operated

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