MPI 41 monitor heater

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Moderator Post (s) for this thread: > Repair by HKestenholz on 02/02/2007

I have a MPI 41 oil heater and the room temp. display will only read 42 degrees, the temp. sensor has the correct voltage and resistance.
Can anyone help me find out either what the problem is or where to find a service manual.

Thank you,
ariekell