Weil-McLain CGi 4 Series - Page 59

Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER — Boiler Manual
59
Troubleshooting — control module lights (cont.)
11c
CHART 7 –– Troubleshooting LWCO and POWER light Solid
and/or “LCO” shown on display
Electrical shock hazardTURN OFF POWER

• System is losing water.
• Repair leak and retest.
Is boiler pressurized?
Ye s N o
• System was low on water.
• Check system fill piping for
leaks or damage.
• Pressurize boiler to system design pressure.
Are lights still solid?
No Yes
• Check system for leaks.
Is system leaking or not
maintaining pressure?
No Yes
• LWCO sensor is bad or fouled.
• Clean LWCO sensor
•
Retest.
Are lights still solid?
No Yes
• Sensor is bad. Replace sensor.
• Retest.
• Sensor was fouled.
• Check water quality and
maintenance schedule.