Weil-McLain CGi 4 Series Manual page 59

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
11c
Troubleshooting — control module lights
CHART 7 ––
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Is boiler pressurized?
Yes
• Pressurize boiler to system design pressure.
• System was low on water.
• Check system fill piping for
Part Number 550-142-302/0520
Troubleshooting LWCO and POWER light Solid
and/or "LCO" shown on display
No
Are lights still solid?
No
leaks or damage.
• LWCO sensor is bad or fouled.
• Clean LWCO sensor
• Retest.
• Sensor was fouled.
• Check water quality and
maintenance schedule.
Boiler Manual
TURN OFF POWER
• Check system for leaks.
Yes
Are lights still solid?
No Yes
• Sensor is bad. Replace sensor.
• Retest.
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Is system leaking or not
maintaining pressure?
No Yes
• System is losing water.
• Repair leak and retest.
(cont.)
59