T87F heat anticipator issue

I'm having a problem with my furnace short cycling.
I have a Honeywell T87F thermostat. I have the heat anticipator maxed out at 1.2 and it still short cycles. The thermostats on my other zones don't have this problem.
How do I tell if the thermostat has gone bad and needs to be replaced?
Scott
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
The T87 is a pretty reliable stat. If you move the anticipator one end to the other with no change, and the stat is mounted level, its either a bad stat or mounted to close to a heat source

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

You check the stat,and if its bad, replace it...check your calibration first, and level, then insure that you didnt fry the anticipation wiring when you moved the slider..since you only adjust that with the power off..and finally, insure that the anticipation resistor on the backside is in working order. If thats all fine, then you have other issues.
The T87F is a bulletproof stat. Rare for them to give a moments issue ever.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Scott wrote:

targets is the symptom of too little.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Are you sure you don't have a furnace that is over heating and short cycling? (Make sure you have replace your filter.)You may also have a problem with your furnace that is causing a high amp draw on the heat anticipator and causing your short cycling problem. You can replace the t-stat, but if that doesn't take care of your problem then you will have to call a Pro out to fix the problem. You could have a bad heat anticipator, but you could also have a problem with your furnace that makes it look like a problem with the heat anticipator.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

This is Turtle.
I take it you have a Natural gas or a Propane furnace by what you have said but I can't see it from here.
If it is Natural gas furnace. Set the Antisipator on the scale at .4 amps.
If it is Propane Furnace . Set the Antisipator on .5 amps.
If it is all electric not heat pump , set the needle to the lowest point on the scale. I have did it so much that i can't remember if it is the 1.2 amps or .01 amps at the bottom of the scale on the T-87.
Then adjust as to the cycle length you want.
Now like other's have said check to see about too many vents being cut off or a dirty filter causing short cycling the high limit switch. If you set it as above and it still does the same thing. It could be any thing and call a service company to come see.
TURTLE
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Its a natural gas, hydronic system. There are 3 zones, and the thermostat that is the furthest from the furnace is the one misbehaving. I don't know if distance matters. The other 2 thermostats are fine.
I had the anticipator maxed out at 1.2 and the furnace would cycle off after about 2 minutes. I experimented with a lower setting (.8 ??) and the furnace cut off in a matter of seconds.
I have Teco zone valves. Can anyone suggest a digital, non-programmable thermostat that is compatible with Teco zone valves and widely available?
I picked up a Honeywell CT8775A digital stat today. But its not compatible with Taco zone valves, so I'm back to square one.
Scott

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

This is Turtle.
Try .01 and a little farther than .2 or .1.
TURTLE
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

We can't see it from here, but I am guessing the thermostat controls the zone valve, not the boiler. The boiler has it's own temperature controls.
Gary R. Lloyd CMS HVACR Troubleshooting Books/Software https://www.merchantamerica.com/tmethod /
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.