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24
HE+ Series Modulating Supplemental Manual
10. TROUBLESHOOTING GUIDE
-
FENWAL DSI
(also see Heater Troubleshooting next page)
SYMPTOM
RECOMMENDED ACTION(S)
1. Dead
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
2. Thermostat on
-
no blower output
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
3. Pressure switch input
okay, but no Trial
-
for
-
Ignition after purge delay
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)
4. Valve on, no spark
A.
Shorted electrode
B.
Open HV cable
C.
Bad DSI control
5. Spark on, no valve
A.
Valve coil open
B.
Open valve wire
C.
Bad control (check 24Vac voltage between V1 & V2)
6. Flame ok during TFI, no
flame
sense (after TFI)
A.
Bad electrode
B.
Bad HV igniter wire
C.
Poor ground at burner
D.
Poor flame (check flame current)
Содержание RHEPM11530N
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