Troubleshooting; Electrostatic Discharge (Esd) Precautions; Resetting From Lockout - Bosch BGH96 Troubleshooting Manual

6 | Bosch 96% AFUE Gas Furnace

2 Troubleshooting

WARNING: FIRE,EXPLOSION AND ASPHYXIATION
HAZARD

Installation and service must be performed by a
qualifi ed service agency or the gas supplier.
Refer to the troubleshooting charts and associated fi gures on the following
pages for assistance in determining the source of unit operational
problems. The diagnostic LED blinks to assist in troubleshooting the unit.
The number of blinks refers to a specifi c code.

2.1 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.
Data subject to change

2.2 Resetting From Lockout

Furnace lockout results when a furnace is unable to achieve ignition after
three attempts. 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. 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.
Troubleshooting Guide
01.2019 | BTC 770502101 A