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109838-01 - 5/20
X-PV
Installation, Operating & Service Manual
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 11.7)
tt On
Heating
Circulator Off
•
Heating Circulator is being forced off on DHW priority (normal operation if
Pt
=ON - see
Table 11.8).
•
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 auxilary limit connection is open.
•
Nothing is connected to auxilary limit connection and jumper plug 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.
13
Troubleshooting
(continued)
