Install Instructions

51
109837-01 - 5/20
PVCG-C
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)