27
Part number 550-100-029/0810
GAS
-
FIRED
WATER
BOILER
SERIES
1 & 2
—
Control supplement & Service guide
Troubleshooting
(continued)
Instructions in this supplement are based
on factory default parameter settings.
SOFT LOCKOUT
[Display flashes 9, then b in first position; last two digits on steady (code)]
25
Outlet water temp rose too quickly
— burner off for 10 minute wait
(burner recycles, increasing wait 1
minute each attempt, to a max of
15 minutes)
1
Possible hot water return from DHW tank.
2
Make sure system does not have trapped air preventing proper flow.
3
Inspect and verify system piping and components.
4
Verify piping agrees with boiler manual recommendations.
5
Verify proper circulator(s) operation.
6
Possible loose connector on boiler outlet sensor. Tighten connector.
7
Possible bad boiler supply outlet sensor.
26
External limit open on limit wired
in soft lockout circuit (auto reset).
Low voltage terminals 6 and 7.
Burner off for 150 seconds
1
If no external limit connected to 6 & 7, verify green jumper wire making good electrical
contact with screw terminals.
2
If external limit connected, verify proper limit operation.
29
Blower signal not zero when it
should be — Burner off until signal
condition corrected
1
Change display to Information mode — if INFO #6 shows 6._32, the blower has
failed.
2
Possible strong wind blowing against vent turning blower wheel, correct venting.
3
Defective blower.
4
Defective control module.
30
Temperature rise across boiler
more than 45°F. — Burner off for
150 second wait (plus 1 additional
minute for each failed attempt,
up to 20 times, then hard lockout
occurs
1
Flow problem through boiler — Temperature rise through boiler should be less than
35°F.
2
Make sure system does not have trapped air preventing proper flow.
3
Inspect and verify system piping and components (including pipe size and circulator
capacity).
4
Verify piping agrees with boiler manual recommendations.
5
Verify proper circulator(s) operation.
6
Possible loose connector on boiler supply/return sensor(s). Tighten connector.
7
Possible bad supply/return sensor — replace sensor.
35
Short circuit across flue
temperature sensor terminals —
Burner off until corrected
1
Shorted wiring to flue sensor— correct the wiring.
2
Defective flue sensor — replace sensor.
40
Open circuit across flue
temperature sensor terminals —
Burner off until corrected
1
Shorted wiring to flue sensor— correct the wiring.
2
Defective flue sensor — replace sensor.
52
Flue Temperature exceeded 216 °F.
but did not exceed 225 °F (hard
lockout occurs above 225 °F —
Burner off for 150 second wait
1
Verify flue temperature with thermometer. If actual temperature does not correlate with
Information mode #5 replace flue sensor.
2
Heat exchanger may need to be cleaned. Follow the boiler maintenance procedure given
in this guide, page 33.
3
Burner problem — verify gas pressure, burner firing rate and combustion per Ultra
Boiler manual procedures — correct any problems.
If combustion is not acceptable, see page 38 in this guide.
65
Waiting for blower to start
1
Change display to Information mode — if INFO #6 shows 6._32, the blower has
failed.
2
Verify blower wiring, 120 VAC on high voltage connector, if no120VAC, inspect/replace
wire harness, or control module.
3
Defective blower.
4
Defective control module.
&IGURE
Troubleshooting procedures — when display shows soft lockout code (continued)
