GMEC96 Installation Manual

51


 Discharge body’s static electricity before touching

components.
Use the following precautions during furnace installation and
servicing to protect the integrated control module from damage.
By putting the furnace, the 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 (un-
grounded) 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;
          
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.

Flame current can be measured in two ways:
1. Putting a D.C. microamp meter in series with the

2. Putting a D.C. volt meter across the two solder pads

1 D.C. volt = 1 microamp. See Figure 41.
Flame Current
Solder Pads
Figure 41

If the control detects the high limit circuit open, the RED
       
indoor blower.

heat, the furnace will go into lockout for one hour. The

The control board can be reset by cycling 115 volt power
to the furnace.
          
minutes, the control assumes the blower has failed the RED


minutes, the control assumes the manual rollout or fuse
         
control will enter a one hour lockout and the inducer will
run continuously.

above but the error code will not be stored in memory until
the limit resets or until 15 minutes has elapsed. So if the

stored. If the limit resets in more than 5 but less than 15



Refer to the Troubleshooting Chart in the back of this manual
for assistance in determining the source of unit operational
problems.

- A control lockout resulting from an external fault
sensed by the control, such as an unsuccessful
recycle or retry period, or a limit trip. Once in
External Lockout, the control will shut down for a
period of one hour before attempting another trial
for ignition.

- A failure internal to the control board.


To retrieve fault codes, push and release the “LAST ERROR”
button for more than 1/5 second and less than 5 seconds
(the LED will indicate this period by solid GREEN for 1/5

fault codes, beginning with the most recent. If there are
          

and the oldest error last. If multiple faults exist there will
be 2 seconds between codes. Solid LED error codes will not
be displayed.

To clear the fault code memory, push and hold the “LAST