Series TA/TX/TXR
Page 35
Jan 07, 2015
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 tap 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.
