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Topic: Entegra Launch 19y - Health Concern - odorless fumes when running heater (Read 59 times) previous topic - next topic
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Entegra Launch 19y - Health Concern - odorless fumes when running heater

Hey everyone,
I recently purchased a 2024 Entegra Launch 19y, and I'm very excited to take it out on my first trip. However, I'm running into a strange and concerning issue. When turning on the heating system, with all the doors & windows closed, fumes accumulate in the cabin.
The fumes are odorless but are detectable via PM 2.5 sensors and reach unhealthy levels. I'm using a Temtop M10 PM2.5 sensor to check this, and I have seen Air Quality Index (AQI) levels reach as high as 140-170, (vs baseline outdoor AQI levels of only 25).
Ater the heating system is warmed up, AQI levels seem to stabilize around 60-70.

My van is equipped with a Timberline hydronic heating system, and is built on a diesel mercedes 2500 van.
The issue is most apparent on cold starts (when the heater is cold). Once the heater is warmed up, the AQI still tends to remain elevated however, hovering at levels of 50-60, which gain is not very healthy over long exposure times.

HOW TO REPRODUCE
1. Begin from a cold start. Ideally the unit would have cooled off overnight.
2. Close all windows, vents, and doors. Set up your sensor and take baseline readings.
3. Leave the sensor at an angle where you can see it from outside the van (via the windshield), so you don't have to open the door.
4. Turn on the van's main cabin power.
5. In the thermostat panel, turn on only the fuel burner. Turn up the temperature to the max.
6. Step outside the van, making sure to close the door behind you.
7. Wait 15-20 min.
8. Check the AQI readings. Mine come in between 140-170 AQI on cold start.

THINGS I'VE TRIED
1. I already tried running the heater the whole day with the doors open to air out the cabin.
2. The folks at the service department adjusted the exhaust pipe to point it further out form the vehicle and tightened a loose hose connection on the heating system.
3. Running the heater in electric only mode still results in a bit of elevation in the AQI levels (50 AQI vs 25 outdoor baseline).

Has anyone run into this problem with their motorhome? And do you have any suggestions on what we might try to fix this?