York 5 red flashes: The normally closed rollout switch has opened

Source: York manual (PDF) (opens in a new tab) ↗ · Updated

Status code5 red flashesYork
What does York 5 red flashes mean?

The normally closed rollout switch has opened. The rollout control is manually reset. The control enters a hard lockout, and power has to be cycled off and on only after the problem is corrected.

Call a pro: jump to when to call a pro Equipment type: furnace
How it shows: LED behind the blower-door view port on a York TG9S. Each flash is 1/3 second on and 1/3 second off, then a 2-second pause: 5 red flashes

York TG9S 5 red flashes means the rollout switch opened. It is a manual-reset switch and a hard lockout. The manual says to check combustion air, inducer operation, and the primary heat exchanger or burners, then cycle power only after that problem is corrected. Do not reset the switch to get through the night. Four red flashes is the main limit, which can be a dirty filter. Five red flashes is not that filter step.

Likely causes

  • Combustion air problem
  • Inducer not operating properly
  • Primary heat exchanger failure or a burner problem

Safe checks for 5 red flashes

  1. Turn the furnace off at its switch or the breaker and leave it off. Do not reset the rollout switch and turn the furnace back on
  2. Techniciancheck combustion air, inducer operation, and the primary heat exchanger or burners before the rollout switch is reset
Safety firstIf you smell gas, do not touch any electrical switch or use a phone in the building; leave immediately and call your gas supplier from outside. Turn off electrical power at the furnace switch or breaker before opening any panel, and never bypass or jumper a limit, rollout or pressure switch. Gas valve, burner, venting, wiring and control-board work should be done by a licensed HVAC technician.

Capacitors can hold a charge after the power is off. Safety terms.

When to call a pro

Call a licensed HVAC technician before the furnace is used again. A rollout switch means flame left the burner area.

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Parts & tools for this fix

Taken from this code's causes or steps. A search link opens Amazon results and does not confirm a fit. Check the model number in the manual.

Furnace inducer (draft) motor: guide

In this code: Inducer not operating properly

This one is for a technician to test or replace, so we only explain it and do not link to buy it.

High limit and rollout switches: guide

In this code: Turn the furnace off at its switch or the breaker and leave it off. Do not reset the rollout switch and turn the furnace back on

A safety device: we explain it but do not link to buy one.

Related York codes

3 red flashesThe pressure switch contacts are open7 red flashesThe flame could not be established6 red flashesWhile the furnace was operating, the8 red flashesThe flame was lost five times9 red flashesReversed line-voltage polarity, a grounding problem,continuous amberFlame sense current is below 1.5

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