Slant/Fin CB-45 Installation And Operating Instructions Manual page 26

TROUBLESHOOTING: POSSIBLE CAUSES AND SOLUTIONS
DIAGNOSTIC "3 FLASHES" - PRESSURE SWITCH PROBLEM
Important Note: Boiler control checks for switch contacts to be open before combustion blower is turned on and
switch contacts to be closed once blower is running and proper air flow is established.
TEST
CAUSE
Check wiring connections to pressure switch. Wires
Electrical wiring?
should go to normally open (N.O.) and common
(C) terminals on switch.
Check that pressure switch contacts are open
Pressure switch is
(between N.O. and C) when blower is off.
defective?
Check for voltage to motor at connector.
Blower motor not
running?
Check for loose or blocked tubing connections to
No or reduced
pressure switch; loose blower hose connection; loose
pressure signal to
blower wheel or wires. Check for blocked air filter,
pressure switch?
vent terminal or vent tubing. Check air flow differential
pressure. See Operation Procedures on page 18.
Check pressure switch calibration. See
Pressure switch is
Troubleshooting Procedures on page 27.
out of calibration?
DIAGNOSTIC "4 FLASHES" - HOT SURFACE IGNITOR FAILURE
Electrical wiring? Check wire connections from ignitor.
Hot surface ignitor Turn power OFF. Carefully remove ignitor from boiler
tip or ceramic (see Troubleshooting Procedures on page 27).
insulator is broken? Check for cracks or breakage.
Hot surface ignitor Energize ignitor while outside of boiler. BE CAREFUL
is defective? OF HOT TIP . Observe glow on ignitor tip. Do NOT
allow hot tip to come in contact with your hand or any
other objects. Turn off gas valve to prevent gas from
exiting ignitor opening and igniting outside of boiler.
DIAGNOSTIC "6 FLASHES" - IMPROPER FLAME SIGNAL
Indicates flame signal detected when gas valve should be closed.
Gas valve Turn gas valve knob to "OFF" position and check
defective? that valve shuts off gas flow.
Flame detector Remove flame detector from boiler. Check for
shorted? coating on rod or material contacting rod inside
ceramic or combustion area.
DIAGNOSTIC "Steady On" - ELECTRONIC CONTROL FAILURE
Electronic Control Control board cannot be serviced. Replacement must be same manufacturer and model.
Is Defective?
26
Refer to Replacement Parts information on
page 31 when parts need to be replaced.
SOLUTION
Correct all wiring connections.
Replace switch if not. Replacement must be
same manufacturer, model and setting.
If voltage is present at connector, motor does
not run, replace blower/motor assembly.
Replacement must be same manufacturer
and model. Check air flow differential
pressure and adjust, if necessary, following
Operation Procedures on page 18.
Secure all loose connections. Tighten
blower wheel set screw. Remove
obstructions. Replace or clean filter.
Re-adjust air flow differential pressure as
shown in Operation Procedures on
page 18.
Replace switch. Replacement must be
same manufacturer, model and setting.
Tighten all wiring connections.
If defective, replace ignitor. Replacement
must be same manufacturer, model and
length.
If tip does not glow quickly and strongly,
replace ignitor. Replacement must be same
manufacturer, model and length.
If gas flow continues, replace valve.
Replacement must be same manufacturer
and model. Calibrate new valve following
Operation Procedures on page 19.
Clean or clear any foreign matter. Replace
flame detector, if necessary, with same
manufacturer, model and length.