Warmer gets to hot over heats coffee - Bunn VPR Coffee Maker

This is really a home style VPR brewer (but looks nicer)
if you listen to their video (link below) they mention it has a pre-heated tank of water already in the brewer. This means the brewer needs to be pre-filled with a full pot of water and pre-heated prior to using the brewer. Unplugging this unit won't be a problem UNLESS it was emptied of tank water and not refilled when powered up.
* The unit will try and heat up the tank of water but if empty then just air which overheats the unit then blows the thermal fuse. Call for service.
* The warmer is still working but it's not hot enough to brew frequently as the warmer may take up to an hour to get the tank hot enough to brew or it may not get hot at all if it's own thermal fuse blew too.
* Final; call for service to be safe.
Aloha, ukboy57
https://www.amazon.com/BUNN-Velocity-10-Cup-Coffee-Brewer/dp/B00EAQJCWW/ref=sr_1_1?ie=UTF8&qid=1516431654&sr=8-1&keywords=bunn+nhs+velocity

NO HEAT ! YOU SHOULD SEE THE BOILER FERST

You will need to check the heating element wiring to see that isn't a short on the neutral side. This could cause them to continue to heat even if the thermostat is working. If all wiring is ok check the function and resistance given by the thermostat.

Most probably the relay that drives both the heating element and the warmer.

A black thing like little box (relay)that containes 8-6 wires (2 from main board and rest just go other components.)
Thanks
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Warmer element may have dropped.Remove 3 screws and check.There are two nuts that fasten warmer to plate.

While this brewer does have a reservoir that keeps a couple of pots worth of water hot for brewing you can get a cooler second pot if you brew directly after. You should hear the brewer heating up after brewing. Try waiting until it is back to temperature before re-brewing. If that heating takes more than a few (3-4) minutes then you probably have a problem with the heating element and the water is only being heated by the "keep warm" heater.

Bunn Home brewers don't perculate. They work the same way that commercial brewers do. Fillit with water, let it heat for about 20 minutes, then put your filter and coffee grounds in the funnel, pour a pot of water into the machine, put the pot on the warmer, and let the water run through. Then enjoy a nice hot cup of coffee.

You must change the thermostat.

CHECK THE BLACK WIRE COMING OFF THE BOTTOM TERMINAL OF THERMOSTAT FOR VOLTAGE, IT SUPPLIES POWER FOR THE WARMER SWITCHES. THE 'READY TO BREW' LIGHT IS PROBABLY A BAD BULB.

Make sure you are using the type of commercial coffee pot like the one in the picture. They don't have to have to be plastic with the metal bottom, they can be all glass. The commercial pots are heavy duty and usually disperse the heat well.

If you are using commercial pots the only solution without replacing the warmers is to put three pennies on the warmer and to put the pot on top of them. The pennies will get hot so don't forget and grab them but the pennies help to move the pot just a little way away from the direct heat.