Lennox Rooftop-Gas Furnace Error Codes

Climatic 50 Roof-Top, Aircoolair & Compactair Version 24

Lennox Rooftop-Gas Furnace Error Codes
Lennox Rooftop-Gas Furnace Error Codes
Error CodesProblem
004Filters, Clogged up
005Filters, Missing
006Recovery Module , Filters, Clogged up
011Electric heating elements
012High Temperature, Blowing
013Low Temperature, Ambient
014Gas burner, 1
015Gas burner, 2
022Low Temperature, Blowing
023High Temperature, Ambient
032Low Humidity, Ambient
033High Humidity, Ambient
051Recovery Module, Motor failure
052Recovery Module, Wheel failure
070Clock card
071BE50, 1
072BE50, 2
081Temperature sensor, Ambient
082Humidity sensor, Ambient
083Temperature probe, Outside
084Humidity sensor, Outside
085Temperature probe, Blower
086Circuit 1, Temperature sensor, Water condenser Outlet
087Circuit 2, Temperature sensor, Water condenser Outlet
088Temperature sensor, return or Mixing air
092Circuit 1, Condenser fan
093Circuit 2, Condenser fan
094Circuit 3, Condenser fan
095Circuit 4, Condenser fan
096Low temperature, Water Condenser
097High temperature, Water Condenser
098Flow rate, water condenser
099Smoke detector
111Circuit 1, Probe or Sensor
115Circuit 1, High pressure or electrical protection
117Circuit 1, Low pressure
118Circuit 1, Risk of Frosting
121Circuit 2, Probe or Sensor
125Circuit 2, High pressure or electrical protection
127Circuit 2, Low pressure
128Circuit 2, Risk of Frosting
131Circuit 3, Probe or Sensor
135Circuit 3, High pressure or electrical protection
137Circuit 3, Low pressure
141Circuit 4, Probe or Sensor
145Circuit 4, High pressure or electrical protection
147Circuit 4, Low pressure

Lennox Gas Furnace Error Codes

Lennox Gas Furnace Error Codes
Lennox Gas Furnace Error Codes

EL180DFE series units are mid-efficiency gas furnaces used for downflow applications only, manufactured with Lennox Duralok heat exchangers formed of aluminized steel. EL180DFE units are available in heating capacities of 44,000 to 110,000 Btuh and cooling applications 1.5 to 5 tons. Refer to Engineering Handbook for proper sizing.

The integrated control is equipped with an LED light for troubleshooting

Off -No power to control or board fault detected

On- Board fault detected,

Heartbeat1- Control powered – displayed during all modes of operation if no errors are detected

1 Reverse Line Voltage Polarity

2 Improper Earth Ground

3 Burner failed to light, or lost flame during heat demand

4 Low Flame Signal – check flame sensor

5 Watchguard – burner failed to light, exceeded maximum number of retries or recycles.

6 Not Used

7 Primary or Secondary Limit Open or Watchguard Mode  – Limit Switch Open longer than 3 minutes.

8 Rollout Switch Open

9 Pressure Switch failed to close or opened during heat demand

10 Watchguard – Pressure Switch opened 5 times during one heat demand

11 Pressure Switch stuck closed prior to activation of combustion air inducer

12 Flame Sensed without gas valve energized

13 Low Line Voltage


Note 1

A ”Heartbeat” is indicated by a ”Slow Flash” – 1 sec on 1 sec off, repeating

Note 2

Error codes are indicated by a ”Rapid Flash” – the LED flashes X times at 1/2 sec on 1/2 sec off, remains off for 3 sec, then repeats

Note 3
Last 10 error codes are stored in memory including when power is shut off to the unit. – To recall, press and release button, most recent will be displayed first, LED off for 3 sec, then next error code is displayed, etc. To clear error codes, depress and hold button longer than 5 seconds.

Lennox AC Error Codes and Troubleshooting


Lennox Rooftop Service Manual


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