Specifications

Part number 550-100-090/0809
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
106
Display
Condition Diagnostics Corrective Action(s)
BLOWER FAULT
Blower unable to reach
required speed or does not
reach 0 RPM when turned off.
Reset using manual reset screen
on display
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.
IGNITION
FAULT
Boiler went through 5 ignition
attempts and never detected
flame
Automatically resets after 1 hour
or can be reset by turning boiler
power off and on.
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 fine 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 (0.138in) 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 flue cleaning tool and rinse
method.
Visual inspection of flueways will often will not be able to diagnose
condition.
Check combustion settings on high and low fire and adjust per setup
instructions if necessary.
Check incoming gas pressure with boiler off and at high fire. Adjust
within limits on rating label.
Verify correct boiler model is selected in control and high altitude is
selected for installations 5500ft above sea level.
Check ignition cable resistance. Should measure 1000 Ohms (+/- 50
Ohms)
Check for flue pipe and intake pipe restrictions or blockage
Check burner fasteners and gaskets
Check venturi gaskets and proper propane orifice
Check condensate trap for blockage allowing condensate to accumulate
inside heat exchanger
Troubleshooting (continued)
Figure 112 Troubleshooting suggestions for Ultra boilers (continued)