
119
XII. Troubleshooting
(continued)
Hard Lockout Codes Displayed
(continued)
Lockout Number
Condition
Possible Cause
24
Fuel Valve Error
Power detected at fuel valve output when
fuel valve should be off.
• Loose or defective gas valve harness. Check electrical
connections.
• Defective gas valve (check for 24 Vac at harness during trial
for ignition before replacing valve).
25
Hardware Fault
Internal control failure.
• Reset the control. If problem reoccurs, replace the R7910.
26
Internal Fault
Internal control failure.
• Reset the control. If problem reoccurs, replace the R7910.
27
Ignition failure
Models PHNTM500C:
Flame failure after 1 try to restart.
• No gas pressure.
• Gas pressure under minimum value shown on rating plate.
• Gas line not completely purged of air.
• Defective Electrode.
• Loose burner ground connection.
• Defective Ignition Cable.
• Defective gas valve (check for 24 Vac at harness during trial
for ignition before replacing valve).
• Air-fuel mixture out of adjustment - consult factory.
27
Interrupted Airflow
Switch (IAS) ON
Air proving switch failed to open.
Air proving switch closed before Prepurge.
• Failed air proving switch. Check switch for proper operation.
• Short in limit string wiring
27
Interrupted Airflow Switch (IAS) OFF
Air proving switch failed to close.
Air proving switch open during Prepurge or Drive Lightoff.
• Check for vent or combustion air pipe blockage.
• Confirm air proving switch hose connected to gas valve outlet
tapping and outlet tapping internal screw is open.
• Loose or defective limit string wiring
42
AC Phase Fault
AC inputs phase reversed
• Check control and display connections.
• Verify line voltage frequency and voltage meet specifications.
• Verify 24VAC transformer functioning properly.
47
Flame Lost
Flame lost at some stage. See display
for details.
• Gas pressure too low. See minimum on boiler rating label.
• Air-fuel mixture out of adjustment. See System Start-Up Section.
• Disconnected or defective flame sensor wire.
• Defective flame sensor.
• Defective gas valve. Before replacing valve, check for 24 VAC at
gas valve connector during trial for ignition.
284
Memory Reset To Default
OEM Memory Lost, Honeywell Default
Memory Restored
• Control failure
• Consult factory
• Replace control
Summary of Contents for Phantom X series
Page 14: ...14 III Pre Installation and Boiler Mounting G General continued Figure 5 Boiler Stacking...
Page 47: ...47 VI Water Piping and Trim continued Figure 28 Near Boiler Piping Heating Only...
Page 71: ...71 IX System Start up continued Figure 47 Operating Instructions...
Page 122: ...122 XIII Repair Parts continued...
Page 126: ...126 XIII Repair Parts continued...
Page 129: ...129 XIII Repair Parts continued 10A 10B 10C 10D 10G...
Page 134: ...134...
Page 135: ...135...