Crown Boiler BWF Series, Supplement Manual

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16
TABLE 13.1: FAULTS WITHOUT ERROR CODE PRESENT
Displayed
Codes Problem Possible Cause
StA 1
tt OFF
dh OFF
Burners and
Circulator Off
Thermostat/s not calling for heat •
Loose connection in thermostat, zone valve end switch, or zone panel wiring. •
Thermostat, zone valve, or zone panel miswired •
Defective thermostat, zone valve, or zone panel •
StA 1
tt On
Burners Off
Circulator On
Boiler Warm
Boiler off on high limit (normal operation) •
Boiler off on thermal purge (normal operation - See Table 10b.6) •
tt On
Heating
Circulator Off
Heating Circulator is being forced off on DHW priority (normal operation if •
Pt
=ON -
see Table 10b.7).
See causes for “DHW Circulator off “ below •
dh On
DHW
Circulator Off
Loose connection in circulator wiring •
Defective circulator •
Circulator is running, but system problem is preventing circulation •
StA 15
Burners Off
and Fan is Off.
Limit or LWCO connected to Option Plug is open. •
No option is connected at the Option Plug and jumper plug (PN 9601830 ) is missing. •
Flame roll-out switch (FRS) open due to blocked heat exchanger. Correct problem and •
replace FRS with exact replacement (see parts list)
StA 6
No spark at
pilot
Loose connection in ignition cable or pilot ground •
Damaged electrode porcelain or ignition wire insulation (replace pilot) •
Pilot electrode or Ground strap damaged (replace pilot) •
If you cannot hear spark at all, replace control •
StA 6
Spark, but no
pilot flame
Low inlet gas pressure •
Plugged, kinked, or leaking pilot tubing •
Plugged pilot orifice •
Gas line not purged of air •
Defective pilot assembly •
Defective gas valve (before replacing, confirm that there is 24VAC between PV and •
MV/PV. If there is not, control harness is loose or the control itself is defective).
Loose connection in harness between control and gas valve. •
StA 6
Pilot flame
present, but
spark does not
shut off
Low inlet gas pressure •
Partially plugged, kinked, or leaking pilot tubing •
Partially plugged pilot orifice •
Loose connection in ignition cable or pilot ground •
Damaged electrode porcelain or ignition wire insulation (replace pilot) •
Pilot electrode or Ground strap damaged (replace pilot) •
Defective Control •
STA 8
Pilot flame
present, spark
off, but Main
Burner does
not light at all
Loose connection in harness between control and gas valve •
Defective gas valve (before replacing, confirm that there is 24VAC between MV and •
MV/PV. If there is not either there is a loose connection in the control harness or the
control itself is defective).
StA 10
Main burner
lights, but
shuts off
immediately
Low inlet gas pressure •
Partially plugged, kinked, or leaking pilot tubing •
Partially plugged pilot orifice •
StA 10
or StA 13
No spark or
pilot
Pilot was either never established or proof of pilot was lost after it was lit. Cycle power •
to the boiler and look for symptoms above.