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

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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

63 ohms

Blue

Brown 110

120 VAC

63 ohms

(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

(SV1) Black

Yellow 80

100 VDC

1,8K

2K ohms

(SV2) Black

Blue 80

100 VDC

1,8K

2K ohms

(SV3) Black

Brown 80

100 VDC

1,8K

2K ohms

(POV) Pink

Pink

15 VDC

81 ohms

C2 3

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

Red

Blue 11

13 VDC

26 ohms

Grey

Brown 4

6 VDC

N/A

Grey

Yellow N/A N/A

Grey

Orange 11

14 VDC

N/A

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

13 VDC

5.5K

6.2K

Yellow

Black 4

7 VDC

1 meg

1.4 meg

By-pass Flow Control:

Brown

White

6 VDC

Unit in operating

Orange

White

mode

Yellow

White

35K G1

Red

White Gnd

(IG) Ignition System:

Grey

Grey 90

100 VAC

N/A

(FM) Combustion Fan Motor:

Red

Black

45 VDC

N/A

White

Black 6

45 VDC

9.2K

9.4K A1 2

Yellow

Black 11

13 VDC 3

.5K

3.9K A1

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.

This manual is related to the following products:

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