241
Moderate
Lennox · HVAC Systems (AC, Furnaces & Heat Pumps)
Low Temperature Rise
Quick Answer
Error code 241 on your Lennox HVAC Systems (AC, Furnaces & Heat Pumps) means: Low Temperature Rise. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Measure supply and return air temperatures and calculate the temperature rise
2
Compare the measured temperature rise to the nameplate acceptable range
3
Check gas manifold pressure with a manometer and adjust to specification
4
Verify blower motor speed setting matches the heating speed tap selection
5
Adjust gas valve regulator or blower speed as needed to bring temperature rise within range
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Gas valve (if regulator is faulty)
Blower motor speed tap wiring
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