Weil-McLain GOLD CGI 550-110-710/0107 User Manual page 57

GOLD CGi Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
CHART 7 — Insufficient heat or no heat to system (POWER light on steady)
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.
• Has it been at least 5 minutes since setting thermostat to
call for heat? If not, wait 5 minutes. Is system heating?
• Is thermostat set to call for heat? Remove thermostat
wires at boiler and check continuity across the two wires.
If circuit isn't closed, check external thermostat (zone
valve, relay, etc.) wiring. Correct problems and retry.
• Reconnect external thermostat wiring at boiler.
Is thermostat circuit closed (continuity across wires)?
No
Are all red lights off?
No Yes
Wait 30 seconds.
Are all red lights off?
No Yes
Replace control
module. Retest.
• If you have sufficient heat — boiler should be in normal
operating sequence. (See normal sequence of
operation, Figure 30, page 37.)
• If you have less than sufficient heat —
Is vent piping free of blockage?
No
• Correct conditions and
recheck operation.
• See Figure 30, page 37
for normal sequence of
operation.
• Wait for boiler water to cool to temperature 20 to 30 °F
lower than temperature set on limit switch.
Are limit switch contacts closed?
No
• Boiler water temperature exceeded
setting on limit switch with thermostat
calling for heat. Boiler is OK. (See normal
• Replace
sequence of operation, Figure 30, p. 37.)
limit switch.
• Also check setting on limit switch (should
• Retest.
be above 140°F.).
Part Number 550-110-710/0107
Yes
• Boiler is in standby.
• Set thermostat to call for
heat and recheck
operation.
• Verify Sequence of
operation, Figure 30,
page 37.
Yes
• Check heat loss
calculation versus boiler
size.
• Clock gas input.
Yes
Is boiler System circulator operating?
No
• Remove CIRCULATOR harness plug from
CIRCULATOR plug receptacle (Figure 38,
Item 7, page 50). Check with voltmeter across pins
of control module receptacle.
Does voltmeter show 120 VAC across pins?
No
• Repair/replace
• Replace control
module.
• Repair/replace
• Retest.
• Wait 5 minutes.
Is FLAME light on?
Yes
Is LIMIT light on?
No
• Check limit switch
contacts with continuity
checker.
Are limit switch contacts
closed?
No Yes
• Replace rollout switch.
If rollout thermal fuse element has
opened, determine cause and
correct condition. Failure to do so
will cause severe personal injury,
death or substantial property
damage.
(cont.)
Yes
Yes
circulator. Retest.
wiring. Retest.
No
Yes
• Replace control module.
• Retest.
Check rollout switch
continuity — is switch
closed?
No Yes
• Check any other
limit controls wired
into the limit
circuit. If all are
OK, then replace
control module.
• Retest.
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