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Skytech · Gas fireplace

4 Beeps Every 2 Seconds Thermal safety - module overheated

Medium severity AF-4000

What the control is telling you

The module's internal temperature went above 170°F.

Applies to: Skytech AF-4000 MOD-1, AF-4000 MOD A and SMART MOD remote modules (used on many fireplace brands)

Likely causes

  • Module mounted in an unapproved, too-hot location (too close to the burner)

Test and repair steps

  1. Let the module cool below 160°F, then press ON.
  2. Check where the module is mounted; if it is too close to the burner or in an unapproved spot, move it somewhere cooler.

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Source: Skytech Audible Alerts & Error Codes for AF-4000 MOD-1 / MOD A / SMART MOD, p.2-3. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.