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READ THIS ENTIRE SECTION BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.
■
This heater can start at any time.
■
Troubleshooting this system may require operating the
heater with line voltage present. Use caution when
working on the heater.
■
Failure to follow this warning may result in property
damage, personal injury or death.
This guide is intended for use by a QUALIFIED HEATER
SERVICE PERSON. DO NOT ATTEMPT TO SERVICE THESE
HEATERS UNLESS YOU HAVE BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital Multimeter - for measuring AC voltage and resistance.
• High Pressure Gauge - for checking pressures at the fuel pump
against dataplate rating.
■
Visually inspect equipment for apparent damage.
■
Check all wiring for loose connections and worn
insulation.
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart. Refer to the Servicing sections as necessary to obtain
information on disassembly and replacement procedures of
the component once the problem is identified by the flow
chart.
Refer to the system operation sequence in this section to gain
an understanding as to how the heater operates during a call
for heat. Understanding the sequence of operation is
important as it relates to problem solving.
If the heater is operating and ignition failure occurs, the
heater will attempt one retrial for ignition. If the retry fails, the
heater locksout, with the reset button emitting a red light
If RED light is observed at reset button:
-- Heater has failed ignition attempt
TO RESET
-- Position the ON/OFF switch to OFF.
-- Push and release the reset button.
-- Red light goes out.
-- Push the ON/OFF switch to ON position (depending
if thermostat is used)
-- Heater begins ignition cycle
-- Light will turn GREEN.
-- If ignition failure occurs and light turns RED, observe
ignition sequence to determine cause of
failure.
WARNING
Troubleshooting Information
Problems
Motor does not run, heater does not light. . . . . . . . . . . . . .19
Motor runs,heater ignites, emits smoke. . . . . . . . . . . . . . . .19
Motor runs, igniter does not spark . . . . . . . . . . . . . . . . . .20
Motor runs, ignitor sparks, heater does not light.
or lights but goes out . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Motor shuts off immediately after burner shuts down . .20
OPERATION SEQUENCE:
-- Power cord is connected to line voltage.
-- Line voltage is sent to fuse.
-- Fuse sends voltage to:
- Indicator lamp
- Heated fuel filter
- Relay
- ON/OFF switch
-- ON/OFF switch set to on.
-- Power sent to thermostat (if used)
-- Thermostat closes and voltage is returned from thermostat
to ignition control. (GREEN light comes on from reset)
-- Ignition control sends voltage to motor relay.
-- Relay closes
- Sends power to fan motor.
- Fan motor starts
- Fan motor turns pump, creating fuel pressure
-- Ignition control module sends voltage to ignition transformer
and to solenoid valve
-- Ignition transformer sends high voltage to igniters
- Ignitors spark
-- Solenoid valve opens
-- Ignition occurs
- Ignitor continues to spark until photocell proves
flame.
- Ignitor stops sparking.
-- Thermostat opens once heat demand is satisfied
--
Ignition control keeps the fan motor running for 90 seconds
to allow a cool down cycle for the heat chamber.
- Ignition control shuts off fan motor
-- Proces begins again on a call for heat
IGNITION FAILURE SEQUENCE:
-- Trial for ignition takes approximately 20 seconds.
-- If photocell does not prove burner flame exists:
-- Fuel solenoid valves close.
-- Ignition spark shuts off.
-- Fan motor stops.
-- RED light comes on from reset.
-- To retry for ignition, the system must be reset:
-- Refer to Reset Instructions
Page
18
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