Weil-McLain 550-110-710/0107 manual Item 8

GOLD CGi Gas-Fired Water Boiler — Boiler Manual

11c Troubleshooting — control module lights (cont.)

CHART 6 — FLAME light flashing and POWER light on steady

ALSO — Troubleshooting failure to establish main flame

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 main manual shutoff valve and boiler gas valve open?

•

Is pilot flame visible through inspection port?

No

Yes

No

Yes

•

TURN OFF POWER

to boiler at service switch or breaker.

•

Check the voltage across

•

Make sure ground wire

• Open main manual shutoff valve and boiler gas valve (per

terminals PV and PV/MV of

terminal is securely fastened

Operating instructions in this manual).

the gas valve.

to control module mounting

• Turn on power at service switch or breaker. A

Is 24 VAC present there?

screw.

Does FLAME light flash now?

Yes

No

No

Yes

• Boiler should be in

• Verify inlet gas pressure at gas

•

If the wiring from the

•

Check the voltage across

valve:

control module to gas

terminals MV and PV/MV of

normal operating

Natural gas — 5.0" w.c. min/14.0"

valve is intact, replace the

the gas valve.

sequence.

w.c. max

control module.

Is 24 VAC present there?

•

Observe operation

•

Retest.

Propane — 11.0" w.c. min/14.0"

No

Yes

until thermostat is

w.c. max

satisfied and blower

Is gas present at gas valve inlet and

has completed its

post-purge cycle.

within above range?

• Verify inlet gas pressure at gas valve:

Yes

No

Natural gas — 5.0" w.c. min/14.0" w.c. max

Propane — 11.0" w.c. min/14.0" w.c. max

•

TURN OFF POWER

to

boiler at service switch or

Is gas present at gas valve inlet and within above range?

breaker.

•

Contact gas supplier to correct

• Remove burner shield (see

pressure or gas supply.

No

Yes

Figure 40, item 4, page 60

for location).

•

TURN OFF POWER to boiler

•

TURN OFF POWER to boiler at service switch or breaker.

at service switch or breaker.

•

Check flame signal — Detach sense lead from ignition control

• Verify pilot gas line is not

kinked, obstructed or

•

Remove burner shield (see

(Figure 38, item 8, page 50).

damaged and is correctly

Figure 40, item 4, page 60 for

•

Connect negative lead of MICROAMMETER to control sense

attached to pilot and gas

location).

terminal (Figure 38, item 8, page 50). Connect positive lead of

valve.

MICROAMMETER to sense wire.

• Verify pilot ignition electrode,

•

Verify pilot burner is securely

•

DISCONNECT red wire connected to terminal MV of the gas

electrode ceramic and spark

attached to pilot bracket, bracket

valve.

lead wire from control are in

is securely attached to cross tie,

•

Turn on power to boiler and allow to cycle. As soon as pilot is

good condition. Spark gap

and there is no corrosion on the

burning, the MICROAMMETER should read at least 1.0

should be approximately 1/8".

parts which would affect the

microamp.

• Correct any above problems,

ground path for flame sense.

Is flame signal at least 1.0 microamp?

replacing pilot if burner or

•

Verify that pilot flame rod, flame

wiring is damaged.

rod ceramic and lead wire from

No

Yes

• Reinstall burner shield to

control module to flame rod are in

operate boiler for retest after

good condition.

•

If none of the previous steps

• If the wiring from the

any changes or corrections.

•

Correct any above problems,

(including replacing pilot)

control module to gas

• If none of the above corrects

replacing pilot if burner or wiring

corrects problem, then replace

valve is intact, replace the

problem, then replace the

is damaged.

the control module, reinstall

control module and retest.

control module and retest.

burner shield and retest.

56 Part Number 550-110-710/0107