| Battery power is not enough | A electric RV furnace can operate on 12 V DC and any problem with this power supply wont open the valve of the furnace. Check the battery output using multimeter to verify this scenario. RV furnace operates with a 10.5 V supply and at times if the battery is not able provide above 10.5V then the furnace wont ignite. A good way to test this out is to run the blower, (blower is apt to operate fine under 10.5 V) if the blower runs then that means the battery supply may be under 10.5 V and thus its not able to open the furnace valve |
| Best way will be to use multimeter and clear the doubts, it would show you exact output voltage. If the battery is good then there could be an issue with the thermostat. Slide anticipator for adjustments. Try setting the temperature to maximum and give some time for it to start, it may take around 30-40 seconds to start the fan |
| The fuse in the furnace is blown | A fuse is used between the DC supply and the RV furnace electric board. A blown fuse will cut the of the battery supply and thus furnace wont ignite. A black or smokey fuse would typically mean it has blown |
| You may not have enough supply of propane or your supply valve for gas is not opening | To verify that you are really not out of propane turn on the furnace and wait for some time. Later go near your exhaust outside of your RV and try to smell near exhaust (be careful while doing this as this can cause injury or burn). If you are not able to smell propane at the exhaust then that means you are out of propane. |
| To further verify if the gas supply is real short, turn on the gas stove and observe the flame if it isn’t very meager then your gas supply is okay but your furnace is not receiving the gas supply probably due to gas valve failure to open. |
| The valve on the furnace could be clogged thus not able to supply the propane to furnace. A bad or damaged valve has to replaced for proper functioning. Some propane supplies have manual turn off valves, you may check on that too. Make sure valve is entirely turned on for proper supply of gas |
| Problem with rv furnace ignitor | Once you start the furnace and smell propane at the exhaust of the camper or RV then that means you have propane supply and the problem could be with the furnace ignitor. In such a scenario you may have to show the circuit board to a rv repair professional. A bad wiring between the igniter and the circuit board can also mean the furnace wont ignite. Another reason could be a dirty spark ignitor. It will not allow the spark to reach the burner and the fuel |
| RV furnace fan runs but there is not heat | Another common problem where in the fan runs but there is no heat or very less heat in the furnace. This could be because of insufficient air flow in the furnace. An internal sail switch senses low air flow and which cause the furnace not to ignite. This means the fan will run but no heat will be produced. |
| A low air flow may be due to problems in ventilation. A blocked heat register can cause the ventilation issues. Even lesser blockages in heat register could cause ventilation issue and less or no heat production |
| RV furnace making loud noise | A noise in the running furnace could be because of dirt in the furnace air registers. You can clean the debris and keep it dirt free for less noise. If its not the dirt then the issue could be with exhaust vent debris. Another reason could pilot light, its a noise for some time when the air is being pushed through pipes to ignite the pilot. Such noise should however go away in some time and shouldn’t last long after your turn on the furnace |
