Troubleshooting Guide - L.B. White Premier 350 Owner's Manual And Instructions

30
Premier Ductable Heaters

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 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.
■ Visually inspect equipment for apparent
damage.
■ Checking all wiring for loose connections and
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 fl ow charts.
The ignition control module is self-diagnostic. The
red light, located within the selector switch, will
fl ash a specifi c light pattern depending upon the
problem which is diagnosed. To effectively use
Owner's Manual • Premier 350
the fl ow charts, you must fi rst identify what the problem
is by the light pattern of the L.E.D. (light emitting diode)
diagnostic light. If the light is fl ashing, the fl ash pattern
will be followed by a pause and then a repeat of the
fl ash pattern until the 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 ........................................... 32
L.E.D. diagnostic light is fl ashing:
A. One Time........................................................ 33
B. Two Times ...................................................... 34
C. Three Times ................................................... 35
D. Four Times ..................................................... 35
E. Five Times ...................................................... 35
Ventilation Mode Problems
A. Motor Does Not Run ...................................... 36
B. Motor "Hums," Does Not Run ......................... 36
C. Motor Runs with Low Air Output .................... 36
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 neces-
sary to obtain information on disassembly and replace-
ment procedures of the component once the problem is
identifi ed by the fl ow 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.
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