Power-Vent Water Heater Blower Not Working
On this page (6 sections)
The Short Answer: A power-vent gas water heater uses an electric blower to push exhaust outdoors, and the burner won’t light until a pressure switch confirms airflow. If the blower never starts, check power first: the cord, a switch, the breaker, or a GFCI. If it runs but the burner won’t light, suspect a blocked vent or the pressure switch. Never bypass the blower.
How the start sequence works
When the tank needs heat, the control starts the blower. The blower creates airflow in the vent, which closes a pressure switch. Only then does the control try to light the burner. If the switch never closes, or the vent is blocked, the control stops and shows a fault, usually as flashes on the gas control or a code on a display. On the Rheem PowerVent ESII described in technical bulletin 1627 (opens in a new tab), for example, three flashes means “pressure switch failed open” and two flashes means “pressure switch failed closed.” Other models use different codes, so read the label on your heater.
What the symptom points to
| What you notice | Likely cause | Urgency |
|---|---|---|
| Silent: no blower, no lights | No 120-volt power: cord unplugged, switch off, breaker or GFCI tripped | Check power |
| Lights on, blower silent on a heat call | Control fault, failed motor or capacitor, or a lockout already in place | Service |
| Blower hums but does not spin | Seized motor or failed start capacitor | Turn off; service |
| Blower runs, burner never lights, fault code | Blocked vent or termination, condensate in the tubing or vent, failed pressure switch | Check outside termination; service if it repeats |
| Blower runs, burner lights, shuts off after a few minutes | Partial vent blockage, overheating switch, or flame sensing problem | Service; see shuts off after 5 minutes |
| Blower loud or grinding | Worn bearings or debris in the wheel | Service; see exhaust blower noise |
What you can check safely
- Make sure the heater’s power cord is plugged in and any nearby switch is on. Plug a lamp into the same outlet to test it.
- Check the breaker and any GFCI outlet that feeds the heater. Reset once if tripped.
- From the ground, look at the outdoor vent termination for snow, ice, leaves, nests, or anything blocking it. Clear only what you can reach safely from outside without putting anything into the pipe.
- Note the flash count or code and photograph it.
- Reset once as the label or manual describes. If it fails again, leave it off.
What the technician will check
A technician checks that the blower gets power when the control calls for heat and whether the motor or its capacitor has failed. They inspect the pressure switch and its tubing for cracks, water, or blockage, and confirm that the vent’s length and number of elbows match the installation instructions. If condensate is collecting in the vent, they correct the slope or drainage. After any repair, they confirm the heater vents correctly while firing.
Repair or replace
Blower motors, pressure switches, and controls are replaceable parts on most power-vent heaters. Whether the repair is worthwhile depends on the age of the tank and whether the parts are still available. If the tank is near the end of its life, compare the repair against replacement; see how old is my water heater.
Frequently Asked Questions
Q: Will a power-vent water heater work during a power outage? A: No. The blower needs electricity, so the heater cannot fire until the power returns. Standing-pilot atmospheric tanks are different. See gas water heater not working after a power outage.
Q: Does my furnace failure have anything to do with this? A: Only if they share power or venting. If both stopped together, see water heater and furnace not working.
Manuals and supporting references
These links distinguish general safety information from model-specific documentation. A manual directory helps you locate your unit’s instructions; it does not establish that every model uses the same parts, codes, or test values.
- Rheem technical service bulletin 1627: PowerVent with Honeywell electronic control (opens in a new tab)Rheem PowerVent ESII models with the Honeywell electronic control; other brands use different sequences and codes.
- PG&E: recognizing and responding to a gas leak (opens in a new tab)Emergency actions for suspected fuel-gas leaks.
- CPSC: carbon monoxide fact sheet (opens in a new tab)Carbon monoxide hazards and emergency response.
Editorial standards and corrections · Prepare a useful service request