Clayton coal/wood furnance not through heat

I have a clayton 1600 coal/wood furnance. Used coal for the past 5 years great. This year can't get a coal fire hot enough to through much heat. I start a wood fire the switch over and have to have ash door completly open to get is coal bed going, when I close door the coal dies out not completly but no heat, I have a barometric damper does'nt seem to help chimney is clear. If I use the injection blow the coal goes cold. Wood on the otherhand burns just fine nice and hot. I've got different coal but it does the same thing Any suggestions

cracken66 wrote:I have a clayton 1600 coal/wood furnance. Used coal for the past 5 years

5 years of anthracite or soft coal?
They are very different as to what is required for a good sustainable fire.

Anthracite coal.

There is a 24 page thread on burning in a clayton furnace successfully burning anthracite coal in a clayton furnace and use the search button top right corner and type in "clayton furnace",your furnace is a US Stove product,(clayton,hot blast,fire cheif,) and you can search that also and welcome
US Stove Hot Blast Furnace Problems

I'll take a look
Thanks