Troubleshooting Guide - L.B.White Boss 400 DF Manual Del Usuario E Instrucciones

Troubleshooting Guide

READ THIS ENTIRE SECTION
BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.
WARNING
■ This heater can start at any time.
■ Troubleshooting this system may require oper-
ating the unit with voltage present and gas on.
Be careful 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 UN-
LESS YOU HAVE BEEN
PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
The following test equipment will be required to
troubleshoot this system with minimal time and
effort.
• Digital Multimeter - for measuring AC voltage and
resistance.
• Pressure Gauge - for checking inlet and pres-
sures at the gas control valve against dataplate
rating.
Ensure all wires and electrical connections are in
good condition before beginning to troubleshoot.
Refer to the system operation sequence in this sec-
tion to gain an understanding as to how the equip-
ment operates during a call for heat. Understanding
the sequence of operation is important as it relates
to problem solving.
The heater has a red status light. The
light will fl ash a specifi c pattern depending upon the
problem which is diagnosed. 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. Use the light to help diagnose the
problem.
Troubleshooting Flow Charts are provided to elimi-
nate problems. To use the fl ow charts effectively,
you must fi rst identify the problem.
Boss DF Construction Heaters
Red light is not on .................................................... 25
Red light is fl ashing:
A. One Time............................................................. 25
B. Two Times ........................................................... 26
C. Three Times ........................................................ 27
D. Four Times .......................................................... 27
D. Five Times........................................................... 27
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 proce-
dures of the component once the problem is identifi ed by
the fl ow chart.
DIRECT IGNITION OPERATION SEQUENCE:
• Voltage sent to circuit breaker
• Voltage delivered to selector switch from breaker
• Selector switch (HEAT) sends voltage to thermostat
• Thermostat calls for heat
• Thermostat send voltage to L1 on ignition control.
- Red light on control panel is illuminated.
• Ignition control performs self- safety check.
- Internal components are tested.
• Ignition sequence begins:
- Ignition control sends 120 VAC to air pressure switch
from terminal PSO.
- Ignition control sends 120 VAC to motor relay from
terminal IND.
- Motor relay receives voltage from ignition
control.
- Motor relay coil closes and sends voltage to
start motor.
- Air pressure switch closes.
- 120 VAC is returned to ignition control
terminal PSI.
- Ignition control sends high voltage to igniter.
- Igniter sparks.
- Ignition control sends 120 VAC to solenoid valve.
- Solenoid valve opens.
- Gas ignites.
- Flame sense proving occurs
- Ignition spark is stopped.
- Gas valve stays open.
- Room warms to desired temperature.
- Thermostat is satisfi ed.
- Heater shuts down
• Process starts again on a call for heat.
Owner's Manual • Boss DF
23
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