Weil-McLain GOLD CGa Installation And Maintenance Manual page 59

Boiler Manual
continued
Chart 7 — Spark-ignited pilot — Insufficient heat or no heat
Electrical shock hazard — Wherever you see
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 24, page 37.)
• If you have less than sufficient heat —
Is vent or combustion air piping free of blockage?
No
• Correct conditions and
recheck operation.
• See Figure 24, 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 24, p. 37.)
limit switch.
• Also check setting on limit switch (should
• Retest.
be above 140˚F.).
Part Number 550-110-593/1099
Yes
• Boiler is in standby.
• Set thermostat to call for
heat and recheck
operation.
• Verify Sequence of
operation, Figure 24,
page 37.
Yes
Contact your Weil-McLain
sales representative.
Yes
▲TURN OFF
POWER▲, follow the instructions. Failure to follow
Is boiler System circulator operating?
No
• Remove CIRCULATOR harness plug from
CIRCULATOR plug receptacle ( Figure 30, Item
7, page 53 ). Check with voltmeter across pins of
control module receptacle.
Does voltmeter show 120 VAC across pins?
No
• Replace control
module.
• Retest.
• Wait 5 minutes.
Yes
No
• Check limit switch
contacts with continuity
checker.
Are limit switch contacts
closed?
No
• Reset spill switch, or replace
rollout switch.
If rollout thermal fuse element or
spill switch has opened, determine
cause and correct condition.
Failure to do so will cause severe
personal injury, death or
substantial property damage.
(POWER light on steady)
Yes
Yes
• Repair/replace
circulator. Retest.
• Repair/replace
wiring. Retest.
Is FLAME light on?
No
Is LIMIT light on?
Yes
• Replace control module.
• Retest.
Check spill switch and
Yes
rollout switch continuity —
are switches closed?
No
• Check any other
limit controls wired
into the limit
circuit. If all are
OK, then replace
control module.
• Retest.
Yes
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