Weil-McLain 550-110-260/02002 manual 11d Troubleshooting — control module lights

Models: 550-110-260/02002

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Are manual main shutoff valve and gas valve open?

GOLD CGs Gas-Fired Water Boiler

11d Troubleshooting — control module lights

CHART 4 FLAME & POWER lights flashing

— Usually indicates flame sensed when it shouldn't be there —

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.

Are manual main shutoff valve and gas valve open?

No

Yes

Leave main manual gas valve closed.

Turn off power to boiler at service switch or breaker.

Wait at least 45 seconds.

Turn on power to boiler.

Restart boiler, following Lighting instructions in this manual (Figure 21, page 34).

Do FLAME and POWER lights still flash?

No

 

Yes

 

 

 

 

• Replace control module.

• Retest.

Turn off power to the boiler at service switch or breaker.

Wait at least 45 seconds.

Turn on power to boiler.

Restart boiler, following Lighting instructions in this manual (Figure 21, page 34).

Look through the pilot inspection port (in front of air inlet box) to see if the pilot is burning during the prepurge period (first 30 seconds of operation).

Is pilot burning during prepurge period?

No

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Allow boiler to continue cycling.

Are FLAME & POWER lights flashing?

No

 

Yes

 

 

 

 

 

 

 

 

 

 

Replace gas valve.

Retest boiler.

Are FLAME and POWER lights flashing?

No

 

Yes

 

 

 

 

 

 

 

 

 

 

TURN OFF POWERto boiler at service switch or breaker.

Open main manual gas valve.

Turn on power to boiler at service switch or breaker.

Restart boiler per lighting instructions.

Perform start-up procedures in boiler manual to verify proper operation.

Boiler may now be operating normally.

Perform start-up procedures in boiler manual to verify proper operation.

Replace control module.

Retest.

Boiler should now operate normally.

Original flashing FLAME light caused by gas valve not operating properly.

See normal sequence of operation, Figure 18, page 31.

Replace control module.

Retest.

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Part number 550-110-260/0200

Page 48
Image 48
Weil-McLain 550-110-260/02002 manual 11d Troubleshooting — control module lights, GOLD CGs Gas-FiredWater Boiler