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BLUNT POINTED
OBJECT
IGNITION CONTROL
RESET SWITCH
(WHITE PUSH BUTTON)
RED
DIAGNOSTIC
LIGHT
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
The following troubleshooting flow charts provide systematic
procedures for isolating equipment problems. The charts
are intended for use by a QUALIFIED GAS HEATER SERVICE
PERSON. DO NOT 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 and DC voltage and
resistance.
• Low Pressure Gauge - for checking inlet and outlet
pressures of the gas control valve against dataplate
rating.
INITIAL PREPARATION
■
Visually inspect equipment for apparent damage.
■
Check all hoses for abrasion and wear. Replace any
that are suspect.
■
Make sure heater is properly installed and meets
minimum clearances to nearest combustible
materials. (Refer to dataplate on the heater.)
■
Check all wiring for loose connections and worn
insulation.
Refer to the system operation sequence in this section
(page 20) to gain an understanding as to how the heater
operates during a call for heat.
Understanding the sequence of operation of the ignition
module and related components is essential as it will relate
directly to problem solving provided by the flow charts.
The ignition control module is self-diagnostic. The red light
on the module will flash a 2, 3 or 5 flash pattern repetitively
depending upon the problem which is diagnosed. To
effectively use the flow charts, you must first identify what
the problem is by the light pattern of the red diagnostic
light. If the light is flashing, the pattern will be followed by a
pause and then a repeat of the pattern until the problem is
corrected. Refer to the table on page 20 for further
direction to troubleshooting any problems.
The red diagnostic light will only be on when the selector
switch is positioned to “Heat” and the thermostat is set
above room temperature. The light will not be on when the
selector switch is positioned to “Vent”.
Ignition Control Lock-Out
■
For safety, the ignition control in this heater continually
monitors air proving components (fan motor and air
proving switch) and burner flame.
■
The ignition control will lock out the control system if it
does not recognize burner flame presence or if air
proving components fail. Either condition causes
control valve closure to occur.
■
Other problems may create a lock-out condition (see
Troubleshooting flow charts), however, most common
reasons for system lock-out are:
-- Improperly shutting the heater down by closing off
the heater’s fuel supply while heater is still in
operation.(Refer to page 14 for proper shut down
procedures.)
-- Not having a sufficient L.P. Gas supply, thereby
allowing the heater to run out of fuel. (Refer to
page 10 for proper sizing of L.P. Gas supply.)
■
System lock-out is identified by:
-- Fan motor not operating
-- Heater no longer burning gas
-- Red diagnostic light on ignition control flashing
2, 3 or 5 times repetitively, depending on problem.
■
The red diagnostic light is located adjacent to the
white reset switch button on the ignition control. The
ignition control is at the gas inlet end of the heater and
is readily seen when the heater’s access door is
opened. The red light and reset switch are easily
located.
■
Ignition control will require resetting when
troubleshooting and repairing the heater. See reset
instructions below.
Resetting Ignition Control
1. Insure heater is connected to an approved electrical
supply and a sufficient gas supply is being used.
2. Open fuel supply valves to heater.
3. Insure selector switch and thermostat are calling for
heat.
4. Using a small pointed object, push down the white
reset switch button on the ignition control and hold
for 4-5 seconds until the fan motor starts. At this
point release the button. The heater will light. See
illustration below.
IMPORTANT
■
Use only light pressure to reset the switch.
■
Excessive pressure may damage the reset.
Troubleshooting Guide
WARNING
Electrical Shock and Burn Hazard
■
Troubleshooting this system may require operating the
unit with line voltage present and gas on. Use extreme
caution when working on the heater.
■
Failure to follow this warning may result in property
damage, personal injury or death.
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