4-FLASH
Daikin · DM96VE0803BN 80,000 BTU 96% AFUE Variable-Speed Gas Furnace with Multi-Speed Blower
High limit switch open — the furnace has overheated and the safety limit switch tripped; check for dirty air filter, blocked ducts and registers, or blower motor failure
Error 4-FLASH on the Daikin DM96VE0803BN 80,000 BTU 96% AFUE Variable-Speed Gas Furnace with Multi-Speed Blower means: High Limit Switch Open. The top-ranked community fix is “Test and Replace High Limit Switch and Inspect Blower Motor” (medium difficulty, ~60 min, DIY cost: $20-$30). 2 community-ranked fixes available below.
Published February 2026 · 2 fixes · furnace
Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.
While many furnace repairs can be done safely at home, consider hiring a qualified technician if:
Average professional repair cost for this issue: $150-$250.
Incorrect Blower Speed Configuration
System Lockout After Ignition Retries
Pressure Switch Stuck Closed
Pressure Switch Failed to Close
Flame Sensed Without Gas Valve Call
Flame Lost During Operation
Ignition Lockout
Igniter Circuit Fault
The Daikin DM96VE0803BN 80,000 BTU 96% AFUE Variable-Speed Gas Furnace with Multi-Speed Blower has 8 other known error codes:
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