Question about Heating & Cooling

Open Question

Honeywell st9400c problems - Heating & Cooling

Posted by Anonymous on

Ad

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
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.
Goodluck!

Posted on Jan 02, 2017

Ad
milten1
  • 1304 Answers

SOURCE: can I upgrade my honeywell st699 programmer to a

it should be a direct replacement

Posted on Oct 05, 2009

Ad
  • 80 Answers

SOURCE: can I upgrade my honeywell st699 programmer to a

Yes.

Posted on Oct 07, 2009

  • 742 Answers

SOURCE: Because the display unit won't light up I haven't got any hot water or heating can someone help

Replace

Posted on Jun 29, 2014

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My honeywell st9400c changing from auto to continuous


How old are the batteries? You may want to replace them to see if it helps. If it doesn't then get a new thermostat. Nothing inside the AC/Heater will cause that.

Mar 24, 2014 | Honeywell Heating & Cooling

1 Answer

Replacing an ST699 with a ST9400C following repl wiring diagram, but programmer does not come on. Is the diagram incorrect? Wiring colours do not follow any of the plans. Syst has room stat, cyl stat,...


Disregard wire colors. Instead wire by terminal designation. In other words :
Wire on "R" Terminal on old thermostat to "R" Terminal on new thermostat no matter the color.

Jun 14, 2011 | Honeywell Heating & Cooling

1 Answer

Mine is a Honeywell st9400c also (same as "andyrobbens") and it also shows "INTERNAL" (not internal fault, just the word "INTERNAL") Switching power off is not resetting it,...


By the way the battery is a common CR2032 battery and can be swapped out in 2 minutes. Turn off the unit at the mains, 2 screws at the bottom, push in the plastic connectors and the battery can be slid out

Jan 15, 2011 | Honeywell Electronic Programmable...

1 Answer

Internal fault


My installer hadn't the foggiest, lots of posts on the internet about this, and no solutions, so here's one I just got to work. Turn off mains to unit. (Note display still shows "INTERNAL FAULT" - this tells us message is maintained by the internal battery.) So, take ST9400C off the mounting plate, and using a small flat blade screwdriver ease out the four clips holding the plastic housing, top/bottom/sides. Now you can see the circuit board, in the middle of which is the lithium cell - ease the copper clip off to take this cell out. Display still says "INTERNAL FAULT" so this tells us a capacitor is maintaining the memory. Noting the large capacitor (blue in my unit) bottom right of the circuit board, short out the wires going to it (by putting your small flat blade screwdriver across both wires). Display no longer shows fault message. Put lithium cell back in, put housing back together, remount unit on backplate, turn on mains supply and unit starts as from new out of the box. Reprogram. Sorted. (I could perhaps have left the capacitor to discharge naturally once the cell was out, but life is too short and I wanted my heating to work.) Hope this helps in the worst UK winter for ages.

Jan 28, 2010 | Honeywell Electronic Programmable...

1 Answer

How to wire in a honeywell 9400c timer clock 4 ch


One of these wires is contains permanent live, neutral and earth. The other wil be heating on and hot water on, the earth on this wire will probably not be used.
you will have to trace the wiring back or test it!! Be carefull!!

Dec 11, 2008 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

29 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2557 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...