GPG16M Service Manual

SERVICING
56
Cooling Mode
Indoor thermostat calling for cool.
1. Check for 230 volts from L1 terminal of control module to
L2. No voltage - check wire connections, continuity, etc.
2. Check for 24 volts at R and C thermostat terminals on
ignition control.
a. No voltage - check 3 amp automotive type fuse on
control board. A blown fuse could indicate a short
in the 24 volt circuit.
b. Voltage present - proceed to step 3.
3. Check for 24 volts at thermostat terminals C and Y1.
a. No voltage - check thermostat wiring and thermo-
stat.
b. Voltage present - check pressure switch circuit. If
pressure switch circuit checks closed, proceed to
step 4.
4. Check for 24 volts at contactor coil.
a. No voltage - check 6 pin connector and wires from
contactor coil to 6 pin connector on control board.
If wires and connector check good, replace con-
trol.
b. Voltage present - replace contactor.
Testing High Stage Cooling Operation with Low Stage
Cooling Operating:
1. Board set for 2 stage thermostat:
a. Check for 24 volts at thermostat terminals C and
Y2 on control board.
b No voltage - check thermostat and thermostat
wiring.
c. Voltage present - check pressure switch circuit. If
pressure switch circuit checks closed, proceed to
next step.
d. Check for 24 volts to compressor unloader sole-
noid. If no voltage present, check 6 pin connector
and wires from compressor unloader solenoid to 6
pin connector on board. If connector and wires
check good, replace control.
2. Board set for 1 stage thermostat:
a. Wait the selected delay time (either 5 or 10
minutes, depending on jumper setting)
b. Check for 24 volts at compressor unloader sole-
noid.
c. No voltage - check 6 pin connector and wires from
compressor unloader solenoid to 6 pin connector
on board. If connector and wires check good,
replace control.
LED
Flashes/Status
System Condition
Off
Internal Control Fault, Micro Controller
Detected Hardware Failure, or Gas Valve
Detected Energized When it Should be
De-energized
1 Lockout Due to Excessive Retries
2 Pressure Switch Stuck Open
3 Pressure Switch Stuck Closed
4 Open High Temperature Limit
5
Flame Present Outside the Flame
Detect Mode
6 Compressor Short Cycle Delay Active
7
Limit Opened Five Times within the
Same Call for Heat
8
Indoor Thermostat/Outdoor Thermostat
is Open
9
Pressure Switch/Loss of Charge Switch
is Open
Steady ON Normal
Red LED Fault Codes
LED
Flashes/Status
Flame Condition
2
Flame Present Outside the Flame Detect
Mode
1 Low Flame Signal Current
Steady ON Normal Flame
OFF No Flame Present
Amber LED Flame Status Codes
NOTE: The flash rate is 0.25 seconds on, 0.25 seconds off,
with a 2-second pause between codes.
S-314 CHECKING FLAME SENSOR
DSI Direct Spark Ignition Systems
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing this unit. Multiple power
sources may be present. Failure to do so
may cause property damage, personal injury
or death.
1. Disconnect the flame sensor wire from terminal FS of the
ignition control module.