Check Your Gauges

This post applies to all EnergyLogic Waste Oil Heaters and Boilers –

Here at NuEra, we are always happy to offer free phone-support for troubleshooting your EnergyLogic Waste Oil Heater or EnergyLogic Waste Oil Boiler. As the new guy, there was a learning curve for me in doing so. It’s one thing for me to look at a Waste Oil Burner and dive into it to fix whatever the problem may be, and an entirely different thing to use YOUR eyes and ears to do the same. In the interest of reducing the amount of down-time for your EnergyLogic Waste Oil Burner, I thought I would offer a few tips for troubleshooting.

The EnergyLogic Pressure Gauge (PN 20270183), and EnergyLogic Vacuum  gauge (PN 20270188), found on your metering pump assembly itself, are your first stop for information on how the Waste Oil Burner is operating.

EL20270188-Vacuum gauge during “normal” operation, reading approximately -4inHg

EL20270183-Pressure Gauge during “normal” operation. Reading approximately 5PSI










Troubleshooting– First, be sure that the ball valve on the inlet side of your Preheater Assembly is in the open position.


EnergyLogic Preheater Assembly with valve open

EnergyLogic Preheater Assembly with valve closed










  • Monitor the gauges when you start the machine. If your EnergyLogic Burner doesn’t light immediately, you have between 15 and 30 seconds to read the gauges before thermal lockout.
  • Pressure Gauge-Should read 6-9 PSI range. Up to 15 PSI is not unusual, but over that and you most likely have some sort of restriction in your fuel line, preheater, solenoid, or nozzle assembly.

EL20270183-Pressure gauge reading approximately 66PSI, indicating blockage in the fuel lines, preheater, solenoid, or nozzle block assembly

  • Vacuum Gauge-Range is very low during normal operation. It should not exceed about -5inHg (vacuum). If it does, then you are likely to have a restriction somewhere between the tank and the pump, as an example your Stainless Steel Filter (PN 20270185) could be clogged
  • In the case where pressure is very low, the output of your EnergyLogic Metering Pump can be tested by simply closing the Preheater valve while the machine is operating. Your Metering Pump assembly is equipped with a pressure relief valve which kicks in between 60 and 70 PSI and reroutes the pressure to the intake side of the pump. A “healthy” pump will generate 60-70 psi within 10 to 15 seconds. A weak or aging pump will take a long time to build pressure, maybe even two minutes.
  • Note- When the Waste Oil Burner shuts off after a heat cycle, it’s not unusual for the Pressure Gauge and (sometimes) Vacuum Gauge to climb to 30 or 40 PSI. As the oil heats, it expands. That pressure is contained by the solenoid valve at the top and check valve at the bottom, so it will register on the pressure gauges.
  • If your gauge readings are in the acceptable range, but the machine won’t light, go on to verify that Waste Oil is reaching the inlet and outlet of the Solenoid Valve, as well as the inlet for the Nozzle Block Assembly while the Waste Oil Burner is trying to light.

    Basic (burnable!!) fuel delivery is the number one cause for ill-behaving machines, and this simple check can save you both time and money.

    EnergyLogic EL140H, EL200H, EL340H, EL350H, EL200B, EL500B, Waste Oil Burner, Nuera, Pressure Gauge, Vacuum gauge


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