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Displayed
Codes
Problem
StA 1
Burners and
tt OFF
Circulator Off
dh OFF
StA 1
Burners Off
tt On
Circulator On
Boiler Warm
tt On
Heating
Circulator Off
DHW
dh On
Circulator Off
Burners Off
StA 15
and Damper is
closed.
No spark at
StA 6
pilot
Spark, but no
StA 6
pilot flame
Pilot flame
present, but
StA 6
spark does not
shut off
Pilot flame
present, spark
STA 8
off, but Main
Burner does
not light at all
Main burner
lights, but
StA 10
shuts off
immediately
StA 10
No spark or
pilot
or StA 13
TABLE 13.1 - FAULTS WITHOUT ERROR CODE PRESENT
Possible Cause
•
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
•
Boiler off on high limit (normal operation)
•
Boiler off on thermal purge (normal operation - See Table 11.6)
•
Heating Circulator is being forced off on DHW priority (normal operation if Pt=ON -
see Table 11.7).
•
See causes for "DHW Circulator off " below
•
Loose connection in circulator wiring
•
Defective circulator
•
Circulator is running, but system problem is preventing circulation
•
Limit or LWCO connected to Option Plug #1 is open.
•
No option is connected at Option Plug #1 and jumper plug (PN 9601830 ) is missing.
•
Blocked vent switch (BVS) open due to problem with vent system, such as a blocked
chimney, or a combustion air supply problem. Correct and press reset button on BVS.
•
Flame roll-out switch (FRS) open due to blocked heat exchanger. Correct problem and
replace FRS with exact replacement (see parts list)
•
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
•
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.
•
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
•
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).
•
Low inlet gas pressure
•
Partially plugged, kinked, or leaking pilot tubing
•
Partially plugged pilot orifice
•
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.
40
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