Why Does an RV Furnace Click But the Blower Won’t Start?
When an RV furnace produces the initial clicking sound but the blower fails to start, it indicates a common issue that can prevent your RV from heating properly. The clicking noise typically signifies that the furnace is attempting to ignite, but the blower motor — responsible for distributing warm air — is not engaging. Addressing this problem promptly is crucial, especially during cold weather or extended trips.
| Common Causes | Solution Overview |
|---|---|
| Blower Motor Failure | Inspect and replace if necessary |
| Faulty Thermostat | Test and recalibrate or replace |
| Blower Motor Relay Issues | Check relay for damage or replace |
| Wiring Problems | Diagnose connections and repair wiring |
| Safety Switch Malfunction | Ensure switches are engaged and functional |
Understanding the RV Furnace System
An RV furnace normally operates by igniting propane gas to produce heat. The process begins with a clicking sound as the igniter activates, followed by the burner igniting. Subsequently, the blower motor turns on to circulate heat through the RV’s ductwork. If the igniter clicks but the blower doesn’t start, the heat will not distribute, leaving the interior cold despite the furnace running.
The blower motor is essential because it pushes warm air out of the furnace and into your vehicle. Without it, heat remains trapped and can also cause safety hazards like overheating.
Common Causes of the Blower Motor Not Starting
1. Blower Motor Failure
The blower motor can wear out over time due to dust accumulation, old bearings, or electrical faults. When the motor fails, the fan won’t spin, resulting in no air circulation. Testing the motor resistance with a multimeter can diagnose a motor problem, which often requires replacement.
2. Faulty Thermostat
The thermostat controls when the blower motor turns on based on temperature settings. A broken thermostat might click during ignition but fail to send the signal to start the blower. Professionals or tech-savvy RV owners can test thermostat continuity and recalibrate or replace it to fix this issue.
3. Blower Motor Relay Issues
The relay acts as an electrical switch to power the blower motor. If the relay is defective, the motor won’t receive the electrical signal despite the furnace ignition. Inspecting the relay for signs of damage, corrosion, or failure can pinpoint the issue.
4. Wiring and Electrical Problems
Loose, damaged, or corroded wiring can interrupt the electrical flow to the blower motor. Regular RV vibration can wear down wiring connections. A thorough inspection of the wiring harnesses connected to the furnace should be conducted to ensure proper function.
5. Safety Switches and Sensors
RV furnaces include safety switches to prevent operation when doors or panels are open. Sometimes these switches can malfunction or get stuck, causing the blower not to start. Check and reset all safety switches and ensure furnace panels are securely closed.
Steps to Troubleshoot an RV Furnace Blower That Won’t Start
- Listen for the ignition click: Confirm that the furnace ignition sequence starts by hearing the clicking sound.
- Check power supply to the blower motor: Use a voltmeter to confirm the motor receives power when the furnace is running.
- Inspect the blower motor: Look for signs of physical damage, noise, or blockage preventing the fan from spinning.
- Test the thermostat: Adjust the temperature setting higher and lower to see if it triggers the blower motor.
- Examine the relay and wiring: Check for blown fuses, damaged wires, or faulty relays affecting motor operation.
- Review safety switches and panels: Make sure all furnace access doors are closed and switches are functioning properly.
Tips for Maintaining Your RV Furnace and Blower
- Regularly clean furnace vents and blower fan blades: Dust and debris can accumulate and impede airflow or motor operation.
- Inspect electrical connections: Periodic checks can help spot frayed wires or loose connections early.
- Test the furnace before cold trips: Run your RV furnace in a warm environment to ensure the blower and ignition work properly.
- Replace worn components: Don’t delay in replacing faulty thermostats, relays, or blower motors to avoid breakdowns.
- Consult professional RV technicians: For complex furnace issues, professional diagnostics ensure safety and correct repairs.
When to Replace Your RV Furnace Blower Motor
If troubleshooting reveals that the blower motor has internal damage such as burnt windings or seized bearings, replacement is often more cost-effective than repair. Typical signs include inconsistent fan operation, unusual noises, or motor failure to start despite receiving power. Replacement blower motors designed for your specific furnace make sure heating efficiency and safety standards are maintained.
Common RV Furnace Models and Blower Motor Compatibility
| Furnace Model | Common Blower Motor Type | Replacement Tips |
|---|---|---|
| Dometic | PSC (Permanent Split Capacitor) Motor | Use OEM parts for best results |
| Suburban | PSC or Shaded Pole Motor | Check specifications based on furnace model and year |
| Atwood | PSC Motor | Consult the furnace manual for compatible motor numbers |
Ensuring Safe Operation of Your RV Furnace
After repairing or replacing the blower motor, it’s important to inspect the entire furnace system including gas lines, igniters, and safety mechanisms. A properly working blower ensures no buildup of combustion gases and prevents overheating, protecting your RV and passengers.