SERVICING
59
Testing Direct Spark Ignition (DSI) Systems
PCBAG127 Board
Heating Mode
Indoor thermostat calling for heat (15 second prepurge time
and 7 second trial for ignition).
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" to "C" thermostat terminals.
a. No voltage - check 3 amp automotive type fuse on
control board. A blown fuse could indicate a short
in the 24 volt circuit (thermostat or limit circuit).
b. Voltage Present - check limit and rollout (S-301
and S-302). If limit and rollout are closed, then
check for 24 VAC at the gas valve terminals.
c. No 24 VAC at gas valve - check 9 pin connector
and wires from ignition control to gas valve. If wires
and connections at 9 pin connector check good,
replace ignition control.
d. Voltage present at gas valve - replace gas valve.
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
L2
INDUCER
LOW
HIGH
L1
OD F
LOW
HIGH
T1
Q3
K4
K3 K5
K6
T2
K7
FS
U1
U2
U6
U7
U4
U5
U3
P2
K2
K1
ECON
STAGE
DELAY
C9
SPEED UP
SW1
FA ULT
RECALL
BLOWER
OFF
DELAY
F1
RCW1W2G Y2
90
120
150
180
10MIN
5 MIN
NONE
PARK
1
2
3
4
5
Y1
PCBAG127 DSI Control Board
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