Our's was replaced under warranty. So, I don't have a price.
We had the Model#: DF2624L.
Our dealer/service company, (at Keystone's suggestion they said...) wanted to replace it with a model#: DF2600L saying the DF2624L was no longer in production and not available. That was a downgrade in my opinion and I pushed back.
Dimplex replaced the DF2624L with the DFR2651L.
After a bit of back and forth, we got the DFR2651L and are happy we did.
Pull your unit and check your model #/Serial #. Since is is working part of the time, Dimplex customer-support may be the best option.
https://www.amazon.com/DIMPLEX-NORTH.../dp/B01F2ID2IQ