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KeepRite · Furnace troubleshooting

Reading stored codes and component test - KeepRite (F/G)9MXT

What is going on

How to recall the last fault and run the built-in component test.

Likely causes

  • Need to find the last fault after it cleared

Check in this order

  1. Remove any thermostat call and wait for delays to finish - codes cannot be read otherwise.
  2. Leave 115 V on. Briefly (2-3 s) jumper TEST/TWIN to the thermostat C terminal (or briefly open one main limit wire).
  3. A stored code flashes 4 times, then the component test starts. No stored code = test starts straight away.
  4. During the test the inducer runs throughout; the igniter and each blower speed run 10-15 s in turn. Gas valve and HUM are not powered.
  5. Stored codes survive power loss and are cleared after 72 hours.
  6. Reading a code count the short flashes for the first digit; the digit after + is the count of long flashes.

Applies to: KeepRite (F/G)9MXT furnaces

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Source: KeepRite/ICP (F/G)9MXT Service and Technical Support Manual 440 04 4321 10, Retrieving Stored Fault Codes / Component Self-Test p.14, Fig. 16 p.24. Written in our own words; check the manual for your exact model.

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.