All installations and services must be performed by qualified service personnel.
9
inspect the furnace at the start of each heating season.
Inform the user of the frequency of inspection required
for reach item in the User Information Section of this
manual.
SERVICE:
TROUBLESHOOTING
THIS SECTION IS ONLY TO BE PERFORMED BY
TRAINED, QUALIFIED SERVICE PERSONNEL, AND
NOT BY THE FURNACE OWNER.
NOTICE:
BEFORE TROUBLESHOOTING,
FAMILIARIZE YOURSELF WITH THE START UP AND
CHECKOUT PROCEDURE.
ALL INSTALLATION AND
SERVICES MUST BE PERFORMED BY QUALIFIED
HEATING CONTRACTORS
When testing electrical equipment, always follow
standard electrical procedures and precautions.
Note – check diagnostic code through view port prior to
removal of door.
1. Check for line voltage (110-120VAC) to the
furnace. If there is no line voltage applied to the
furnace, check that disconnecting switch is “on”,
fuses or circuit breakers have not blown or
tripped.
2. Make sure thermostat is “calling for heat”.
3. Check for adequate fuel supply and pressure. Are
all the fuel shutoff valves open?
4. To assist you in troubleshooting this furnace, it is
equipped with an integrated ignition control with
diagnostics. These diagnostics evaluate what
malfunction the control system has experienced
and will activate a flashing light on the control in
different sequences to help pinpoint the failure.
DIAGNOSTIC FEATURES
The integrated control continuously monitors its own
operation and the operation of the system. If a failure
occurs, the LED will indicate a failure code as shown
below. If the failure is internal to the control, the light will
stay on continuously. In this case, the entire control
should be replaced, as the control is not field-repairable.
If the sensed failure is in the system (external to the
control), the LED will flash in the following flash-pause
sequences to indicate failure status (each flash will last
approximately 0.25 seconds, and each pause will last
approximately 1 second).
LED Off - No power to control, pushbutton switch
pressed, or control fault
LED steady ON (Any color) - Control hardware fault
detected
Slow Green flash - No call for heat, no active errors
Slow Orange flash - Call for heat present, no active
errors
1 RED flash - High limit switch open
2 RED flashes - Pressure switch open with inducer on
3 RED flashes - Pressure switch closed with inducer off
4 RED flashes - 1 hour lockout code
5 RED flashes - Incorrect line voltage polarity or
incorrect polarity on 24 VAC line from transformer
6 RED flashes – Too many limit trips in one call for heat
7 RED flashes – Pressure switch cycle lockout
8 RED flashes - Too many flame dropouts detected
9 RED flashes – Not Used
10 RED flashes – Flame present with gas valve off
Rapid flash – Incorrect 24 VAC phasing/twinning error
Fault Code History
The control stores the last 5 fault codes. Press the
pushbutton switch and release within 5 seconds, the
control will flash the stored fault codes (in red color). The
most recent fault code is flashed first, the oldest fault
code is flashed last. If the fault history is empty, the
control will flash the LED in green color 2 flashes.
To clear fault history hold the pushbutton switch for more
than 5 seconds and rerelease. The control will flash the
LED in green color 3 flashes to indicate fault memory
has been cleared.
The control keeps the LED off while the pushbutton
switch is pressed to provide visual feedback and to
assist determining when fault history display begins.
Power must be disconnected before servicing.
Summary of Contents for GMA1-60D48N
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