HVACopediaICP · Furnace
1+5 Blower motor lockout
What the control is telling you
Blower did not reach 250 RPM or did not communicate within 30 seconds after start-up in two heat cycles in a row. Auto-resets after 3 hours. Troubleshoot as code 4+1.
Applies to: ICP F9MAE / G9MAE modulating variable-speed condensing gas furnaces (060, 080, 100, 120 kBtu/h)
Likely causes
- Rubbing or loose blower wheel
- Wiring fault between control and blower motor
- Failed blower control module / motor
- Failed furnace control
Test and repair steps
- Warning: Turn power off before touching the blower or its connectors.
- Follow the 4+1 procedure check the wheel turns freely and is tight on the shaft.
- Check 115 VAC at PL14-5/PL14-4, 12 VDC and 5 VDC on PL13 and PL3 as in code 4+1.
- Repair open wires/bad terminals or replace the blower control module or furnace control as indicated.
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Source: ICP (F/G)9MAE Service and Technical Support Manual 440 04 4700 00, Figure 16 Troubleshooting Chart, p.34. Summarized in our own words; check the original manual for your model.
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