Goodman Error Code b1: Lost communication with blower motor (Furnace)
Goodman error code b1 on a furnace means: Lost communication with blower motor. It is also called Goodman diagnostic code b1.
Homeowner? What Goodman code b1 means for you
Call a technician Your furnace is reporting: Lost communication with blower motor. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Goodman error code b1 mean?
The control cannot talk to the blower motor. Furnace will not run. ComfortNet thermostat shows MOTOR COMM b1.
Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces
Common causes of Goodman code b1
- Loose motor control (signal) leads
- Failed blower motor
- Failed furnace control
Goodman models that use code b1
GCVC90704CXGCVC90905DXGCVC91155DXGCVC950714CXGCVC950915DXGMVC950453BXGMVC950704CXGMVC950905CXGMVC950905DXGMVC951155DX
Other Goodman Furnace codes
All Goodman Furnace error codes →
Goodman code b1: homeowner questions
What does Goodman code b1 mean?
Lost communication with blower motor. The control cannot talk to the blower motor. Furnace will not run. ComfortNet thermostat shows MOTOR COMM b1.
Is it safe to keep using my furnace with code b1?
It depends on the cause. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Goodman code b1 myself?
You can try one reset (power off for 30 seconds, then on). If Goodman code b1 comes back, the cause is still there and a licensed technician should check it.
Who can fix Goodman code b1 near me?
Aurora Star Tech Inc. repairs Goodman furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
Troubleshooting guides
- Blower cycles on and off All brands · Furnace
- Blower runs, not enough heat All brands · Furnace
- Blowing cold air All brands · Furnace
- Board shows "flame sensed with no call for heat" All brands · Furnace
- Can't pull oil (distance/lift) All brands · Furnace
- CO in flue / poor combustion numbers All brands · Furnace
- Cold air blast at start / blower never stops All brands · Furnace
- Combustion gas / odour in house, flu-like symptoms All brands · Furnace
- Cycles on limit (not lockout) All brands · Furnace
- Does not start All brands · Furnace
- Flame burns a few seconds then out All brands · Furnace
- Flame conditions table All brands · Furnace
- Heat exchanger leak All brands · Furnace
- High blower-door ACH50 (>3) All brands · Furnace
- High fuel consumption All brands · Furnace
- High stack temperature All brands · Furnace
- High stack temperature / low efficiency All brands · Furnace
- Indoor blower runs, outdoor unit dead All brands · Furnace
- Limit opens All brands · Furnace
- Locks out — oil but no ignition All brands · Furnace
- Low CO2 (<8 %) All brands · Furnace
- Low draft / blowback All brands · Furnace
- Modulating furnace won't modulate All brands · Furnace
- Negative house pressure, backdrafting, infiltration All brands · Furnace
- No heat All brands · Furnace
- No heat All brands · Furnace
- No heat (ignition stage) All brands · Furnace
- Noisy All brands · Furnace
- Noisy registers, drafts, blower overamps/ECM noise, coil freezing All brands · Furnace
- Not running / fault code All brands · Furnace
- Oil + ignition OK but no flame All brands · Furnace
- Oil on floor All brands · Furnace
- Pressure switch open / stuck All brands · Furnace
- Puff-back / delayed ignition All brands · Furnace
- Reduced airflow, hot motor All brands · Furnace
- Reduced pressure, smoky shutdowns, lockouts All brands · Furnace
- Rollout switch tripped All brands · Furnace
- Short cycling All brands · Furnace
- Smoke, soot, odour, pulsation All brands · Furnace
- Starts but locks out — no oil at nozzle All brands · Furnace
- Too little / too much air All brands · Furnace
- Unsatisfactory heat (short cycles / uneven / not enough) All brands · Furnace
- Water flows with furnace off All brands · Furnace
- Clear an E0 lockout (3 ways) Goodman · Furnace
- ComfortNet data line check - Goodman *MVC95/*CVC9 Goodman · Furnace
- Control display blank, furnace dead - Goodman/Amana 9-speed ECM furnaces Goodman · Furnace
- Display blank, furnace dead - Goodman *MVC95/*CVC9 Goodman · Furnace
- No heat - Goodman/Amana 9-speed ECM furnaces Goodman · Furnace
- Open the furnace advanced menus from a ComfortNet thermostat Goodman · Furnace
- Poor combustion / flame problems - Goodman/Amana GM9C96 Goodman · Furnace
- Reload model data with the memory card Goodman · Furnace
- Reset the ComfortNet network (learn button) Goodman · Furnace
- Reset the furnace control to factory defaults (rFd) Goodman · Furnace
- Temperature rise out of range - Goodman *MVC95/*CVC9 Goodman · Furnace
- Turn on dehumidification Goodman · Furnace
- Use a single-stage thermostat (timed staging) Goodman · Furnace
- View and clear the last 6 furnace faults Goodman · Furnace
- View and clear the last 6 stored faults (L6F) Goodman · Furnace
Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Troubleshooting Chart p.53-57. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.