Advertisement
10. TROUBLESHOOTING GUIDE - FENWAL DSI
(also see Heater Troubleshooting next page)
SYMPTOM
1. Dead
2. Thermostat on
- no blower output
3. Pressure switch input
okay, but no Trial-for-
Ignition after purge delay
4. Valve on, no spark
5. Spark on, no valve
6. Flame ok during TFI, no
flame sense (after TFI)
HE+ Series Modulating Supplemental Manual
RECOMMENDED ACTION(S)
A. Mis wired - check electrical supply (120Vac ± 5%)
B. Transformer bad (24Vac ± 10%)
C. Fuse/Circuit breaker bad
D. Bad DSI control (check LED for steady on)
E. 24VDC Power Unit is bad
A. Mis wired
B. Bad thermostat no voltage @ terminal W
C. Bad control (check LED for steady on)
D. 24VDC Power Unit is bad
E. Modulating Controller bad
A. Mis wired (check PSW terminal voltage: 24Vac ± 10%)
B. Flame sense problem (existing flame: check LED - 2 flashes)
C. Bad DSI control (check line voltage between L1 & IND)
A. Shorted electrode
B. Open HV cable
C. Bad DSI control
A. Valve coil open
B. Open valve wire
C. Bad control (check 24Vac voltage between V1 & V2)
A. Bad electrode
B. Bad HV igniter wire
C. Poor ground at burner
D. Poor flame (check flame current)
24
Advertisement
