Vi - troubleshooting – LAARS IGI-180C-5(N,X) - Service Manual User Manual

Page 27

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27

VI - TROUBLESHOOTING

(cont.)

Quick Reference Diagnostic Points

IMPORTANT SAFETY NOTES:

There are a number of (live) tests that are required when fault finding this product. Extreme care

should be used at all times to avoid contact with energized components inside the water heater.

Only trained and qualified service agencies should attempt to repair this product.

Remember, before checking for resistance readings, you should disconnect the power source

(unplug it) to the unit and isolate the item to be checked from the circuit.

(TR) Transformer:

Wire color

Voltage

Resistance

Connector #

Pin #’s

Black

~

White 100

~

120 VAC

51

~

63 ohms

F9

1

~

2

Blue

~

Brown 110

~

120 VAC

51

~

63 ohms

F7

1

~

3

(SV0, SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)

(SV0) Pink

~

Black 80

~

100 VDC

1,8K

~

2K ohms

E1

1

~

2

(SV1) Black

~

Yellow 80

~

100 VDC

1,8K

~

2K ohms

E2

2

~

3

(SV2) Black

~

Blue 80

~

100 VDC

1,8K

~

2K ohms

E3

2

~

4

(SV3) Black

~

Brown 80

~

100 VDC

1,8K

~

2K ohms

E4

2

~

5

(POV) Pink

~

Pink

2

~

15 VDC

67

~

81 ohms

C2 3

~

4

(M) Water Flow Control Device Servo or Geared Motor:

Red

~

Blue 11

~

13 VDC

22

~

26 ohms

B2

9

~

10

Grey

~

Brown 4

~

6 VDC

N/A

B2

5

~

7

Grey

~

Yellow N/A N/A

B2

5

~

8

Grey

~

Orange 11

~

14 VDC

N/A

B2

5

~

6

NOTE: The grey wire listed above turns to black at B connector on the PCB, the orange wire turns to red.

(QS) Water Flow Sensor:

Black

~

Red

11

~

13 VDC

5.5K

~

6.2K

B4

5

~

6

Yellow

~

Black 4

~

7 VDC

1 meg

~

1.4 meg

B4

1

~

5

By-pass Flow Control:

Brown

~

White

2

~

6 VDC

Unit in operating

G4

~

G5

4

~

5

Orange

~

White

mode

G2

~

G5

2

~

5

Yellow

~

White

15

~

35K G1

~

G5

1

~

5

Red

~

White Gnd

G3

~

G5

3

~

5

(IG) Ignition System:

Grey

~

Grey 90

~

100 VAC

N/A

F8

2

~

3

(FM) Combustion Fan Motor:

Red

~

Black

6

~

45 VDC

N/A

A1

1

~

2

White

~

Black 6

~

45 VDC

9.2K

~

9.4K A1 2

~

4

Yellow

~

Black 11

~

13 VDC 3

.5K

~

3.9K A1

2

~

3

Set your meter to the Hertz scale. Reading across the red and yellow wires at terminals 2 and 3 you should

read between 60 and 350 Hertz.

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This manual is related to the following products:

IGI-180R-10(N,X) - Service Manual

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