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American Standard E08: Flame current is low, but still strong enough to allow operation

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

Status codeE08American Standard
What does American Standard E08 mean?

Flame current is low, but still strong enough to allow operation.

Homeowner part this code names: furnace flame sensor.

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Call a pro: jump to when to call a pro Equipment type: furnace
How it shows: 7-segment display on an American Standard S9V2 two-stage variable-speed furnace: E08

American Standard S9V2 E08 means flame current is low and the furnace is still allowed to run. The sequence gives a typical range of 0.75 to 3.0 microamps, read as DC volts on the FP pads. E2.2 is what happens later if flame is sensed and then lost often enough to lock out. Measuring the current is a technician step.

Likely causes

  • Low flame current while the furnace is still allowed to run

Safe checks for E08

  1. The furnace may still heat. Write down E08 before it is cleared
  2. Technicianmeasure flame current at the flame sensor. This guide reads it on the FP pads, typically 0.75 to 3.0 microamps
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 to measure and correct the low flame current before it becomes a lockout.

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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 flame sensor: guide

In this code: Low flame current while the furnace is still allowed to run

Liberon grade 0000 ultrafine steel woolSearch: American Standard furnace flame sensorSearch: Fine steel wool, 0000 grade

Nut driver set: guide

In this code: Panels and parts on a furnace are held by hex-head screws; a nut driver grips them without stripping.

See the guide for what to look for when buying one.

Multimeter for appliance and HVAC diagnosis: guide

Technician step in this code: measure flame current at the flame sensor. This guide reads it on the FP pads, typically 0.75 to 3.0 microamps

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

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Related American Standard codes

E05Flame was detected when it shouldE09Open inducer limit switch, or openE12Open fuseE2.1Retry exceededE2.2Recycles exceededE3.1Shorted pressure switch, 1st stage

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