Lennox Error Code E276: Watchguard calibration failure (Furnace)
Lennox error code E276 on a furnace means: Watchguard calibration failure. It is also called Lennox diagnostic code E276.
Homeowner? What Lennox code E276 means for you
Call a technician Your furnace is reporting: Watchguard calibration failure. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Lennox error code E276 mean?
Pressure switch calibration failed; 1-hour soft lockout.
Applies to: EL296UHV(X) series furnaces with integrated control 103130-XX only
Common causes of Lennox code E276
- Vent system problem
- Pressure switch wiring fault
Lennox models that use code E276
Show all 22 models
EL296UH045XV36BEL296UH070XV36BEL296UH090XV36CEL296UH090XV48CEL296UH090XV60CEL296UH110XV48CEL296UH110XV60CEL296UH135XV60DSL280UH060NV36ASL280UH070V36ASL280UH080NV48BSL280UH080NV60CSL280UH090V36BSL280UH090V48BSL280UH090V60CSL280UH100NV60CSL280UH110V60CSL280UH135V60DSL297UH040NV36BSL297UH060NV36BSL297UH080NV48CSL297UH080NV60C
Other Lennox Furnace codes
All Lennox Furnace error codes →
Lennox code E276: homeowner questions
What does Lennox code E276 mean?
Watchguard calibration failure. Pressure switch calibration failed; 1-hour soft lockout.
Is it safe to keep using my furnace with code E276?
It depends on the cause. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Lennox code E276 myself?
You can try one reset (power off for 30 seconds, then on). If Lennox code E276 comes back, the cause is still there and a licensed technician should check it.
Who can fix Lennox code E276 near me?
Aurora Star Tech Inc. repairs Lennox furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.36, Maintenance p.87. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.