Install Instructions

Part Number 550-142-902/1016

CGi

GAS-FIRED WATER BOILER — SERIES 3 — Boiler Manual

Troubleshooting — control module lights (cont.)

11c

CHART 7 –– Troubleshooting Sensor Ground and POWER light Solid

and/or “LCO” shown on display

Electrical shock hazard — Wherever you see ▲ TURN OFF POWER ▲, follow the instructions. Failure to follow

instructions could result in severe personal injury, death or substantial property damage.

Is harness securely connected to control?

Yes No

• Control had poor connection,

boiler should resume operation.

• Secure connector.

Is the Sensor ground light still solid or ﬂashing?

No Yes

• Check ground continuity from Pin 4 of P5

terminal to ground connection.

Is there continuity?

No Yes

• Secure wire to earth ground.

•

Retest.

Is the Sensor ground light still solid or

ﬂashing?

No Yes

• Ground was improperly connected.

• Boiler should resume operation.

• Check for stray voltage on ground and

neutral wires.

Yes No

• Check and secure ground source to

earth ground connection.

Is the Sensor ground light still solid or

ﬂashing?

Yes No

• Correct incoming power and ground-

ing issues.

• Replace control.