Series Premier VS-VH
Page 63
LT135 Dec 2019
TROUBLE-SHOOTING
Vacuum Pump
Vacuum Pump Fails to Run
1. Check that a Thermostat is calling for heat.
2. Check the main Electrical Power Supply, fuses or breakers.
3. Check for power to the Control Panel or Relay.
Vacuum Pump Runs, But Little to No Vacuum
1. Check the direction of the impeller rotation.
2. Are the End Vent Caps installed in all the Branches?
Vacuum Pump Runs, But No Power to Burners
1. Check the Vacuum Switch.
2. Check voltage to Burner terminals.
3. Check Relay.
4. Check individual Burner control.
Burners
No Power to Burner
1. Check if correct Thermostat is calling for heat.
2. Check for 120VAC supply at Burner.
No Gas Supply
1. Ensure manual supply valve to the System is turned ON.
2. Ensure gas valve knob on Burner gas control is ON.
3. Check for 24V across valve terminals during ignition trial time.
Burner Does Not Light
1. Ensure spark is present during ignition trial.
2. (If no, check control module, check for cracked ignitor insulation.)
3. Ensure there is gas flow during ignition trial.
4. Purge gas lines.
5. Ensure Filter is not obstructed.
Burner Does Not Stay Lit
1. Check ground wire from ignitor for continuity.
2. Measure flame signal current, it should be above 5uA - DC.
3. Regulator adjustment may be necessary.
4. Ensure Filter is not obstructed.
