Weil-McLain 550-110-260/0508 manual 11d Troubleshooting — control module lights cont, item 8, page

GOLD CGs Gas-Fired Water Boiler — Boiler Manual

11d Troubleshooting — control module lights (cont.)

CHART 5 — 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.

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

• Check the voltage across

terminals "C" and "A" of the

•

Make sure ground wire

Lighting instructions in this manual). Wait at least 45

gas valve (see Table G,

terminal is securely fastened

seconds.

page 33).

to control module mounting

• Turn on power at service switch or breaker. Allow boiler to

screw.

cycle.

Is 24 VAC present there?

Does FLAME light flash now?

Yes

No

No

Yes

• Check the voltage across

• Boiler should be in

• Verify inlet gas pressure at gas

•

If the wiring from the

terminals "B" and "A" (see

valve:

control module to gas

Table G, page 33) of the

normal operating

Natural gas — 5.0" w.c. min/14.0"

valve is intact, replace 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

has completed its

Is gas present at gas valve inlet and

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

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

boiler at service switch or

•

Contact gas supplier to correct

breaker.

No

Yes

• Remove air inlet box top

pressure or gas supply.

(see Figure 27, page 56 for

location).

•

▲TURN OFF POWER▲ to boiler

• ▲TURN OFF POWER▲ to boiler at service switch or breaker.

•

Check flame signal — Detach sense lead from igntion control

• Verify pilot gas line is not

at service switch or breaker.

kinked, obstructed or damaged

• Remove air inlet box cover (see

(Figure 25, item 8, page 46).

and is correctly attached to

•

Connect negative lead of MICROAMMETER to control sense

Figure 27, page 56 for location).

pilot and gas valve.

terminal (Figure 25, item 8, page 46). Connect positive lead of

• Verify pilot ignition electrode,

MICROAMMETER to sense wire.

electrode ceramic and spark

•

Verify pilot burner is securely

•

DISCONNECT red wire connected to terminal "B" (see Table

lead wire from control are in

attached to pilot bracket, bracket is

G, page 33) of the gas valve.

good condition. Spark gap

securely attached to cross tie, and

•

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

should be approximately 1/8".

there is no corrosion on the parts

burning, the MICROAMMETER should read at least 1.0

• Correct any above problems,

which would affect the ground path

microamp.

replacing pilot if burner or

for flame sense.

Is flame signal at least 1.0 microamp?

wiring is damaged.

•

Verify that pilot flame rod, flame rod

No

Yes

• Reinstall air box top to operate

ceramic and lead wire from control

boiler for retest after any

module to flame rod are in good

changes or corrections.

condition.

•

If none of the previous steps

• If the wiring from the

• If none of the above corrects

•

Correct any above problems,

(including replacing pilot)

control module to gas

problem, then replace the

replacing pilot if burner or wiring is

corrects problem, then replace

valve is intact, replace the

control module, reinstall air box

damaged.

the control module, reinstall air

control module and retest.

top, and retest.

box cover and retest.

Part number 550-110-260/0508

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