Payne PG95ESA Error Code 33: Limit Circuit Fault

What Does Code 33 Mean?

Status code 33 on the Payne PG95ESA indicates a limit circuit fault. A limit switch or flame rollout switch is currently open, which stops the burners while the blower continues running to cool the heat exchanger. This is an active warning that the furnace is overheating.

If the limit or flame rollout switch stays open for longer than 3 minutes, the code will escalate to lockout code 13 and the furnace will shut down completely for 3 hours. Acting quickly when you see code 33 can prevent the lockout from occurring.

The most common cause is a dirty air filter or restricted duct system that reduces airflow across the heat exchanger, causing it to overheat. The PG95ESA manual specifically mentions checking the blower wheel, loose blower wheel connections, dirty filter, and proper duct size and connections. A flame rollout switch trip, which indicates a combustion air issue, is a less common but more serious cause that requires professional attention.

Common Causes

How to Fix It: Replace the Air Filter and Restore Airflow

What You'll Need

• Replacement air filter (correct size for your system) 🛒 Find at FiltersFast · 🛒 Find at Amazon
• Flashlight

Steps

1. Turn off electrical power at the breaker and shut off the gas supply valve Locate the furnace circuit breaker and flip it to OFF. Turn the gas shutoff valve to the OFF position (perpendicular to the pipe). If you smell gas, leave immediately and call your gas company.
2. Check and replace the air filter Remove the air filter from the return air duct or furnace filter slot. If it is visibly dirty, clogged, or has not been changed in over 3 months, replace it with a new filter of the correct size. Make sure the airflow direction arrow on the new filter points toward the furnace.
3. Verify all supply and return vents are open Walk through every room and ensure all supply registers and return grilles are fully open and not blocked by furniture, curtains, or rugs. Even a few closed vents can significantly restrict airflow and cause overheating.
4. Inspect the blower area With the power off, look at the blower wheel through the access panel opening. Check for excessive dust buildup on the blower blades, which can reduce airflow. Also verify the blower wheel is securely attached to the motor shaft and not wobbling — the PG95ESA manual specifically lists a loose blower wheel as a cause for this code.
5. Restore power and gas, then test Turn the gas supply valve to ON and flip the circuit breaker to ON. Set your thermostat to call for heat and monitor the furnace through its heating cycle. Code 33 should not reappear if the airflow issue has been resolved.

When to Call a Professional

Contact a licensed HVAC technician if:

• Code 33 returns after replacing the filter and opening all vents
• The code escalates to code 13 (limit circuit lockout) repeatedly
• The flame rollout switch has tripped (a red button on the switch needs manual reset)
• The blower wheel is loose, damaged, or excessively dirty
• You hear unusual noises from the blower motor

✓ Verified against manufacturer service manual — March 2026