ERROR MODE
LED INDICATION
Internal Control Failure
Steady on
Flame with No Call for Heat
2 flashes
Ignition Lockout
3 flashes
FAULT CONDITIONS
The LED will flash on for 1/4 seconds, then off for 1/4 second
during a fault condition, the pause between fault codes is
3 seconds.
TROUBLESHOOTING GUIDE
SYMPTOMS
RECOMMENDED ACTIONS
1.Dead
A. Miswired
B. Transformer bad
C. Fuse/Circuit breaker bad
D. Bad control (check LED for steady on)
2. Thermostat on- no spark
A. Miswired
B. Bad t’stat no voltage@ terminal W
3. Valve on, no spark
A. Shorted electrode
B. Open HV cable
C. Miswired
D. Bad control
4. Spark on, no valve
A. Valve coil open
B. Open valve wire
C. Bad control (check voltage
between V1 & V2)
5. Flame okay during TFI,
A. Bad electrode
no flame sense (after TFI)
B. Bad S1 or HV wire
C. Poor ground at burner
D. Poor flame (check flame current)
6. Flame with no call for heat
A. Stuck valve (check LED for 2 flashes)
FLAME CURRENT CHECK
Flame current is the current which passes through the flame from
the sensor to ground. The minimum flame current necessary to keep
the system from lockout is .7 microamps. To measure flame current,
connect an analog DC microammeter to the FC - FC+ terminals.
Meter should read .7 uA or higher. If the meter reads below “0” on
scale, meter leads are reversed. Disconnect power and reconnect
meter leads for proper polarity.
HIGH VOLTAGE CABLE
Fenwal Part Number 05-129608-624 Suppression Cable
(or equivalent) must be used for proper operation of control.
IGNITOR LOCATION
Figure 3
WIRING DIAGRAM
Series 35-62, 24 VAC Dual Point DSI Control
Page 3
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1-800-FENWAL-1
