Question about Heating & Cooling
Two of the 4 thermostats in our house (for water circulating radiant heat) have on occasion had blank screens for several hours, then spontaneously came back on. Turning them off and on or changing the temperature had no effect. Is this a known problem> Should they be replaced?
I have the same problem. It's because your domestic hot water (dhw) is on the same system as your radiant heat. In these systems, dhw is given priority over floor heating. That is, when your dhw needs heat, power to your Tstats are shut off until your dhw is satisfied. (Makes sense: cold showers no fun) Your T8400B's have no battery, so they are dead unitl power to them is restored by your zone control. It's really stupid that they use these Tstats, because you can't even SEE your room temp or settings let alone change them. I will be replacing my Tstats with battery powered soon; hopefully that will allow me to see and adjust during dhw cycles.
Posted on Nov 07, 2009
Most likely a bad tstat i would replace I recommend honeywell focus pro 6000
Posted on Aug 29, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Feb 15, 2016 | Honeywell Biasi B10-3 Boiler ,riello...
on Dec 05, 2009 | Heating & Cooling
Apr 09, 2014 | Honeywell Programmable Thermostat Heater
Nov 05, 2009 | Honeywell Programmable Thermostat Heater
Sep 28, 2009 | Honeywell Electronic Programmable...
Jul 11, 2009 | Honeywell Programmable Thermostat Heater
Jun 21, 2009 | Honeywell Heating & Cooling
Dec 17, 2008 | Honeywell Programmable Thermostat Heater
506 people viewed this question
Usually answered in minutes!