Pressure switch open with inducer on code#
Pressure switch open with inducer on trial#
Pressure switch open with inducer on professional#

No light indicates that no power is going to the control. Place trouble light between the black and white leads. If the burner starts, fault is in the detector circuit. If burner starts, then fault is in the thermostat circuit.ĭisconnect the flame detector wires at the primary control. Touch jumper wire across thermostat terminals on primary control. Lennox O23 Furnace Troubleshooting SourceĬheck burner motor, primary safety control, & auxiliary limit switch.Ĭheck furnace disconnect switch & main disconnect. Pressure switch stuck closed prior to activation of combustion air inducer Watchguard – Pressure Switch opened 5 times during one heat demand Pressure Switch failed to close or opened during heat demand Primary or Secondary Limit Open or Watchguard Mode – Limit Switch Open Longer than 3 minutes Watchguard – burner failed to light, exceeded maximum number of retries or recycles. No power to control or board fault detectedĬontrol powered – displayed during all modes of operation if no errors are detectedīurner failed to light, or lost flame during heat demand

Pressure switch open with inducer on code#

Lennox A80UH1E Furnace Troubleshooting RED LED Flash Code Humidifier connections are energized when the burner motor is energized. (Optional connectors are available for 120 Vac humidifier.) (Optional connectors are available for separate circulating fan speed tap.)Ĭirculating fan is energized at low speed when there is no call for heat, cool or fan.

Oil primary control is energized, initiating burner light off.Ĭontinuous circulating fan is connected. Heat fan off delay (60 to 120 seconds) begins.Ĭirculating fan turns off after the selected heat fan off delay timing. If there is a call for cooling or fan, the circulating fan switches from heat speed to cool speed. (G terminal is de-energized.)Ĭirculating fan is energized immediately at heat speed.Ĭirculating fan runs as long as limit string stays open. (G terminal is energized.)Ĭirculating fan is energized immediately at cool speed. (G and Y terminals are de-energized.)Ĭirculating fan and cooling compressor turn off immediately. (G and Y terminals are energized.)Ĭirculating fan is energized at the cool speed.

Pressure switch open with inducer on trial#

If heat fan off delay is longer than the recycle delay timing, the heat fan continues to run through the next trial for ignition. If heat fan has started, it continues through the delay off period.īurner motor is de-energized and oil primary control goes into recycle mode. Oil primary control locks out within lockout timing (timing depends on oil primary control). Oil primary control and circulating fan are off. When timing is complete, the circulat- ing fan is de-energized. Heat fan off delay (60 to 120 seconds) timing begins. Oil primary control is de-energized, terminating the burner cycle. When timing is complete, the circulating fan is energized at heat speed and warm air is delivered to the controlled space. Oil flows as long as cad cell senses flame.īurner motor is energized and heat fan on delay timing begins. Ignition system and oil primary control start the furnace. Lennox ELO183DH Series Furnace Troubleshooting Action

Pressure switch open with inducer on professional#

In that case, you will not be able to fix your furnace without professional help. If you cleaned the pilot light but nothing happened, the cause may hide in poor gas flow which is quite a different story.

Inspect the pilot light and try to relight it if it’s out by carefully cleaning it.