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I need help troubleshooting Tempstar furnace Honeywell ST9162A 1040 Board

Blower: DC motor Variable speed Speed Control: Emerson X177265620004

Symptom: No Inside blower in Cool mode.

Outside AC is working fine. Inside blower will not work.

Thermostat: Replace new, same issues.

  • Tstat switch set to Heat, and Fan set to AUTO, Heat runs normally: Inside Blower/Fan starts and runs normally. Then, set Tstat system switch to off then Blower shuts off.

  • Tstat System switch set to Off, and Fan set to On, Blower runs normally (continuous).

  • Tstat System set to Cool, and Fan set to AUTO, outside AC run normally, inside Blower did not run then turning Fan to On inside Blower remains off.

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Mazura
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Victor
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1 Answers1

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Let's summarize.

TH +FA = all runs Heat mode

TF = F-runs Fan only mode

TC + FA = F does not runs Cooling mode

Would say your control board is fine, but it is getting signal not to run.

That would indicate the drip pan water overflow sensor is active. It is ignored in heat mode, it is ignored in fan only mode, but it is used in Cooling+Fan mode.

A quick Test:

Use pice of wire and bridge the Y an G

T - Thermostat F- Fan C- cooling H- Heating A- Auto mode

DIY75
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