Weil-McLain ULTRA299-S4 Manual page 122

S 4
®
ERIES
Troubleshooting
Figure 125 Troubleshooting suggestions for Ultra boilers
Condition
Display
Blower unable to reach
required speed or does not
reach 0 RPM when turned off .
Boiler went through 5 ignition
attempts and never detected
fl ame.
122
-
GAS FIRED WATER BOILER
(continued)
Diagnostics
Automatically resets after 1 hour
or can be reset by using manual
reset on screen.
Automatically resets after 1 hour
or can be reset by using manual
reset on screen.
— Boiler Manual
(continued)
Check wire harness for loose connections and pin engagement at blower
connections, chassis mount connection through sheet metal cabinet,
and U-Control module. Unplug connection at sensor and at U-Control
and check continuity between ends. Blower is connected to both low
voltage and line voltage harness.
Check Diagnostics - Inputs screen with boiler in standby mode and
blower not running. If BLOWER SPEED is not 0 RPM then replace blower.
If blower does not rotate during ignition sequence check for 120V power
at blower connection. If 120Vac power at blower motor and it doesn't
start replace blower. Check power at U-Control. If 120Vac is not present
at U-Control when boiler is powered replace U-Control. Refer to repair
parts section.
Check condensate trap for blockage allowing condensate to accumulate
inside heat exchanger
Fouled, worn, bent, or faulty igniter.
Fouled igniters can be cleaned for additional use with fi ne grit sand
paper or steel wool.
Worn or badly fouled igniters should be replaced with the proper repair
part.
Igniter rods should be parallel with a 3.5mm (0.138 in) spark gap.
Dirty burner and/or heat exchanger will cause high back pressure and
poor ignition. Follow procedure in maintenance section of this manual
to clean burner and heat exchanger using fl ue cleaning tool and rinse
method.
Visual inspection of fl ueways will often will not be able to diagnose
condition.
Check combustion settings on high and low fi re and adjust per setup
instructions if necessary.
Check incoming gas pressure with boiler off and at high fi re. Adjust
within limits on rating label.
Verify correct boiler model is selected in control and high altitude is
selected for installations 5500 ft above sea level.
Check ignition cable resistance. Should measure 1000 Ohms (+/- 50
Ohms)
Check for fl ue pipe and intake pipe restrictions or blockage
Check burner fasteners and gaskets
Check venturi gaskets and proper propane orifi ce
Check condensate trap for blockage allowing condensate to accumulate
inside heat exchanger
Corrective Action(s)
Part number 550-100-400/0717