When Display Shows Soft Lockout Code - Weil-McLain ULTRA ULTRA-105 Service Manual

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GAS FIRED WATER BOILER SERIES
Troubleshooting
Troubleshooting procedures — when display shows soft lockout code
SOFT LOCKOUT
Code Reason for soft lockout
18 High limit operation — burner off
until outlet water temp drops below
203 °F minus the ON differential
19 Return water temperature higher
than 203 °F. — burner off until
return water temp drops below
203 °F minus the ON differential
24 Return temp higher than supply
temp — Burner off waiting for
supply temp to rise above return
temp
26
—
1 & 2
(continued)
[Display flashes 9, then b in first position; last two digits on steady (code)]
Corrective actions
Electrical shock hazard. Turn off power to boiler when working with
wiring or replacing any boiler component.
1 This should only happen when the heat demand is lower than the lowest firing rate of
the boiler, such as operation of a single, small zone. Check system for:
2 Verify boiler and system are full of water
3 Make sure system does not have trapped air preventing proper flow
4 Inspect and verify system piping and components (including pipe size and circulator
capacity)
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
8
Verify proper direction of water flow through boiler
1
Verify boiler and system are full of water
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
8
Verify proper direction of water flow through boiler
1
Verify boiler and system are full of water
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
8
Instructions in this supplement are based
on factory default parameter settings.
(pressing RESET should restart boiler immediately)
Part number 550-100-029/0810