Crown Aruba 5 Installation Manual

40
TABLE 13.1 - FAULTS WITHOUT ERROR CODE PRESENT
Displayed
Codes Problem Possible Cause
StA 1
tt OFF
dh OFF
Burners and
Circulator O
• 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 O
Circulator On
Boiler Warm
• Boiler o on high limit (normal operation)
• Boiler o on thermal purge (normal operation - See Table 11.6)
tt On
Heating Circulator
O
• Heating Circulator is being forced o on DHW priority (normal operation if Pt=ON - see
Table 11.7).
• See causes for “DHW Circulator o “ below
dh On
DHW Circulator O
• Loose connection in circulator wiring
• Defective circulator
• Circulator is running, but system problem is preventing circulation
StA 15
Burners O and
Damper is closed.
Green LWCO light
is on. Yellow light
is o.
• External limit connected to Option Plug is open.
• No option is connected at Option Plug 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)
StA 15
Burners O and
Damper Closed.
Both Green and
Yellow lights are on.
• Low water condition exists in boiler. Verify that boiler and heating system are completely
lled with water.
• Temperature probe is not inserted into well.
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
ame
• Low inlet gas pressure
• Plugged, kinked, or leaking pilot tubing
• Plugged pilot orice
• Gas line not purged of air
• Defective pilot assembly
• Defective gas valve (before replacing, conrm 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 ame present,
but spark does not
shut o
• Low inlet gas pressure
• Partially plugged, kinked, or leaking pilot tubing
• Partially plugged pilot orice
• 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 ame present,
spark o, but Main
Burner does not light
at all
• Loose connection in harness between control and gas valve
• Defective gas valve (before replacing, conrm 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 o
immediately
• Low inlet gas pressure
• Partially plugged, kinked, or leaking pilot tubing
• Partially plugged pilot orice
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.