SYMPTOM
Control will not start up
Thermostat on and no ignition
Valve on - no ignitor
Ignitor on - no valve
Flame okay during TFI but
no flame sense after TFI
LED off
LED INDICATION
ON
OFF
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
FAULT MODE
Normal Operation
Internal Control Failure - Check Power
Airflow Fault
Erroneous Flame Signal
Ignition Lockout
Hot Surface Ignitor Fault
Low Voltage (24 VAC)
Valve Relay Problem
RECOMMENDED ACTIONS
A. Miswired
B. 24 VAC Transformer bad
C. Fuse/Circuit breaker bad
D. Bad control, check LED for
steady or flashing codes
A. Miswired
B. Bad thermostat, no voltage at
thermostat terminal
C. Failed ignitor
A. Defective ignitor
B. Miswired
C. Bad control, check voltage at ignitor
A. Valve coil open
B. Open valve wire
C. Bad control, check voltage
at gas valve terminal
A. Bad ignitor
B. Bad wire
C. Poor ground at burner
D. Poor flame, check flame current
A. Verify 24 VAC present
B. Recycle Power
C. If problem persists, replace control
ON BOARD DIAGNOSTICS
TROUBLESHOOTING GUIDE
TERMINAL DESIGNATIONS - P2 & P3 CONNECTOR
Table 2
CAUTION:
Label all wires prior to disconnection when servicing the control.
Wiring errors can cause improper and dangerous operation.
A functional checkout of a replacement is recommended.
WARNING:
Operation outside specifications could result in failure of the
Fenwal product and other equipment with injury or death to
people and damage to property. Service to this product should
only be preformed by a qualified technician
5
!
Series 35-67, 24 VAC Hot Surface Ignition Control
Page 3
www.fenwalcontrols.com
1-800-FENWAL-1
PIN
LOCATION
1
2
3
4
5
6
7
8
9
10
11
WIRE
COLOR
ORANGE
RED
VIOLET
GRAY
BROWN
BLUE
YELLOW
GREEN
WHITE
WH/BLACK
BLACK
DESCRIPTION
Lockout Indicator
Thermostat
Lockout Indicator (Ground Side)
Airflow (PSW)
Gas Valve
24 VAC (Full Time)
Reset Button
Ground
Pre-Purge Indicator
Pressure Switch Option
Remote Sense
11-PIN MATING
CONNECTOR
AMP P/N 1-770849-1
PINS AMP P/N 350980-1
TERMINAL
DESCRIPTION
MATING
CONNECTOR
QUICK
CONNECTS
Ignitor
24, 120 or 240VAC
Input (Hot)
Neutral
Ignitor
Inducer Power
Supply
Inducer Blower
Remote LED
Connector
Flame Current
Test Pins
S1
L1
L2
S2
F1
F2
P3/P7
FC+ & FC-
Tyco 2-520183-2
PINS 350919-3
MOLEX 22-01-2021
PINS 08-500114
Tyco 61260-1
¼ inch optional
¼ inch optional
¼ inch optional
¼ inch optional
¼ inch
¼ inch
TERMINAL DESIGNATIONS - P1 CONNECTOR
Table 1
5
!
SOFT LOCKOUT RECOVERY
The control will attempt automatic recovery from Fault Codes 1,4,5,
and 6 by a soft lockout mechanism. The control will wait 5 minutes
and if the thermostat is still calling for heat it will attempt a restart
sequence. If the error persists it will be detected and the control will
continue in this soft lockout and retry sequence every 5 minutes
until the problem is corrected.
