L.B. White Premier 40 Series Owner's Manual And Instructions page 25

Troubleshooting Guide
READ THIS ENTIRE SECTION
BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.
WARNING
■ This heater can start at any time.
■ 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.
The following troubleshooting guide provides
systematic procedures for isolating equipment
problems. This guide is intended for use by a
QUALIFIED GAS 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 and DC
voltage and resistance.
• Low Pressure Gauge - for checking inlet and
outlet pressures at the gas control valve against
dataplate rating.
■ Visually inspect equipment for apparent
damage.
■ Check all wiring for loose connections and
worn insulation.
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.
Four green lights are located next to the selector
switch. Each light will be acitvated in sequence
as that circuit within the heater is verifi ed by the
ignition control. If the circuit is not verifi ed, that
respective light will not be activated. The most
common heating mode problems are identifi ed
Premier Ductable Heater
by a green light being OFF if a specifi c fault occurs.
However, two other problems may also occur. See the
following.
Identify the specifi c problem and then refer to the
appropriate troubleshooting fl ow chart.
Heating Mode Problems
Power status light not on .................................... 27
Transformer status light not on ........................... 27
Air proving status light not on ............................. 28
Gas control status light not on ............................ 29
All lights are on, fan motor runs,
burner does not light ........................................... 30
All lights are on, EXCEPT gas valve light.
Fan motor does not run, burner does not light. .. 31
Heater lights but does not stay lit ....................... 31
Ventilation Mode Problem
Motor Does Not Run ........................................... 31
Components should be replaced only after each step
has been completed and replacement is suggested in
the fl ow chart. Refer to the Servicing sections as
necessary to obtain information on disassembly and
replacement procedures of the component once the
problem is identifi ed by the fl ow chart.
DIRECT IGNITION OPERATION
SEQUENCE:
• The thermostat calls for heat.
- Power light acitvated indicating heater is receiving
its main power supply.
• Line voltage is sent to selector switch.
• Selector switch sends line voltage to the transformer
and to ignition control.
• Transformer reduces line voltage to 24 volts which is
sent to ignition control.
- Transformer light is activated indicating that ignition
control is receiving 24 volts from transformer.
• Ignition control module performs self safety check.
• Fan motor starts.
• Ignition control module sends 24 volts to air
proving switch.
- Internal components are tested.
- Air proving circuit is checked and proven.
• Ignition control module begins ignition trial sequence.
Owner's Manual • Premier 40
25
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