Installation, Operation & Maintenance Manual
Bosch 96% AFUE Gas Furnace
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Bosch Thermotechnology Corp.
|
04.2019
Data subject to change
14 Troubleshooting
14.1 Electrostatic Discharge (ESD) Precautions
NOTICE:
Discharge body's static electricity before touching unit.
An electrostatic discharge can adversely aff ect electrical
components.
Use the following precautions during furnace installation and servicing to protect
the integrated control module from damage. By putting the furnace control and the
person at the same electrostatic potential these steps will help avoid exposing the
integrated control module to electrostatic discharge. This procedure is applicable
to both installed and uninstalled (ungrounded) furnaces.
1.
Disconnect all power to the furnace. Do not touch the integrated control
module or any wire connected to the control prior to discharging your
body's electrostatic charge to ground.
2.
Firmly touch a clean unpainted metal surface of the furnace away from
the control. Any tools held in a person's hand during grounding will be
discharged.
3.
Service integrated control module or connecting wiring following the
discharge process in step 2. Use caution not to recharge your body with
static electricity; (i.e. do not move or shuffl e your feet do not touch
ungrounded objects etc.). If you come in contact with an ungrounded
object repeat step 2 before touching control or wires.
4.
Discharge your body to ground before removing a new control from its
container. Follow steps 1 through 3 if installing the control on a furnace.
Return any old or new controls to their containers before touching any
ungrounded object.
14.2 Resetting From Lockout
Furnace lockout results when a furnace is unable to achieve ignition after
three attempts. It is characterized by a non-functioning furnace, refer to the
Troubleshooting chart (pg 50-51) which describes what errors LED fl ashes
correspond to. If the furnace is in "lockout" it will (or can be) reset in any of the
following ways.
1.
Automatic reset. The integrated control module will automatically reset
itself and attempt to resume normal operations following a one hour lockout
period.
2.
Manual power interruption. Interrupt 115 volt power to the furnace for 1 -
20 seconds.
3.
Manual thermostat cycle. Lower the thermostat so that there is no longer a
call for heat for 1 - 20 sec.
If the condition which originally caused the lockout still exists, the
control will return to lockout. Refer to the Troubleshooting Chart (Table
24-26) on the following page for aid in determining the cause.
WARNING: FIRE,EXPLOSION AND ASPHYXIATION HAZARD
Installation and service must be performed by a qualifi ed
service agency or the gas supplier.
14.3 Troubleshooting Chart
Refer to the troubleshooting chart on the following pages for assistance in
determining the source of unit operational problems. The red diagnostic LED blinks
to assist in troubleshooting the unit. The number of blinks refers to a specifi c code
(See Tables 25 & 26).
