Series
LTA/LTX/LTXR
Page
37 Nov./21/12
Troubleshooting
Blower Motor Fails to Run
•
Is the thermostat calling for heat? Is there 115V at the burner receptacle?
•
Check blower side door for seal. Repair as necessary.
•
Check blower for obstructions. Replace blower if necessary.
No Gas Supply
•
Check to see if manual supply valve to heater is ON.
•
Check to see if gas valve knob on heater gas control is ON.
•
Supply gas pressure can be checked at 1/8" NPT pressure tapping in gas supply system.
•
Is combination gas control opening? No manifold pressure indicates valve is closed. Gas pressure
downstream of gas control can be measured by connecting a manometer to pressure tap on control.
If the valve is closed, either the gas valve or the ignition module is faulty.
Burner Does Not Light
•
Is spark visible through site glass during ignition trial? If no, further electrical checks by a
qualified service person are required.
•
Check to see if gas lines were properly purged of air.
•
Check inlet and outlet gas pressure during ignition period.
•
Check for proper orifice and air plate.
Burner Does Not Stay Lit
•
Check ground wire continuity.
•
Check insulation on the igniter leads.
•
Measure flame signal current; it should be between 2 to 6 micro amps dc. Minimum 0.8 micro
amps.
•
Clean flame rod if necessary.
•
Replace module if necessary.
