Lennox ZGD036 Error Codes

Packaged HVAC · Packaged Unit

Model numbers in this family: ZGD036, ZGD048, ZGD060, ZGD074

• 2 Lockout. Failed to detect or sustain flame.
• 3 Prove switch open or closed or rollout switch open.
• 4 Limit switch is open and/or high limit has opened three times.
• 5 Flame sensed but gas valve solenoid not energized.
• Fast Normal operation. Call for heat.
• Slow Normal operation. No call for heat.
• Steady Off Internal control fault OR no power to control OR Gas Valve Relay Fault.
• Steady On Control internal failure.

Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.