L.B. White Premier TS350DF Owner's Manual And Instructions page 25

Troubleshooting Guide
READ THIS ENTIRE SECTION
BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.
WARNING
operating the unit with line voltage present and
gas on. Use extreme caution when working on
the heater.
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 HEAT-
ERS 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.
• Low Pressure Gauge - for checking inlet
and outlet pressures at the gas control valve
against dataplate rating.
damage.
worn
Refer to the system operation sequence in this
section to gain an understanding as to how the
equipment operates during a call for heat. Under-
standing the sequence of operation of the ignition
module and related components is esential as it
will relate directly to problem solving provided by
The ignition control module is self-diagnostic. The
red light, located within the selector switch, will
problem which is diagnosed. To effectively use
Premier Ductable Heaters
the light pattern of the L.E.D. (light emitting diode) diagnostic
problem is corrected. Refer to the tables below to identify
what page to refer to when troubleshooting any problems.
The L.E.D. 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.
Heating Mode Problems
L.E.D. light is not on ........................................... 27
A. One Time........................................................ 28
B. Two Times ...................................................... 29
C. Three Times ................................................... 30
D. Four Times ..................................................... 30
E. Five Times ...................................................... 30
Ventilation Mode Problems
A. Motor Does Not Run ...................................... 31
C. Motor Runs with Low Air Output .................... 31
Components should be replaced only after each step has
chart. Refer to the Servicing sections as necessary to obtain
information on disassembly and replacement procedures
chart.
DIRECT IGNITION OPERATION
SEQUENCE:
-- Selector switch is set to heat.
-- Line voltage is sent to ignition control and to
transformer.
-- Transformer reduces line voltage to 24 volts which is sent
to thermostat.
-- The thermostat calls for heat.
-- The thermostat sends 24 volts to ignition control.
-- Red light is illuminated
-- Ignition control module performs self safety check.
-- Internal components are tested.
-- Air proving circuit is checked.
-- Ignition control module begins ignition trial sequence.
-- Ignition control module sends 24 volts to air proving switch.
-- Ignition control sends line voltage to motor relay
-- Motor relay closes and fan motor starts.
-- Air proving switch closes and 24 volts are returned to the
ignition control module.
-- Ignition control module sends high voltage to the igniter
electrode.
-- Igniter sparks.
Owner's Manual • Premier 350
25
Page
Page
......................... 31