webasto heater overheating?

Bernardtravis

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6 Mar 2009
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Can anyone offer advice please? My webasto heater runs perfectly for approx 20 minutes then the overheat trip triggers & it turns off . After 5 minutes I restart it & it runs another 20 minutes & fails again. It starts first time . I have disconnected the out put pipework to the cabins so there is nothing impeding the airflow. The exhaust & combustion pipes are clear. I have stripped the outer airflow casing & there are no blockages. The fan appears to run at the correct speed & we have good airflow. The fan is not stiff & rotates freely by hand : Still the trip operates after 20 minutes! Logic tells me the trip is over sensitive unless someone knows differently? I am loathe to invest in a new overheat sensor unless this is a common problem. Any help appreciated. It is a 3.2 KW heater
 
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