Question about Heating & Cooling

Open Question

Hi. I have a Honeywell ST9400C timer on the boiler but after a power cut, the backup light has stopped working. It is set to installer parameter "2" to be on continuously and is still set to that. However, the light isn't on. Do I need a new timer as the backup light is very useful in a fairly dark room or can I fix it? Thanks, Judy

Posted by on

Ad

6 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
bigbiggs
  • 326 Answers

SOURCE: PROGRAMMABLE ROOM THERMOSTAT

I found this on a search:
"I have the full set of instructions, contact me at gjb@eggconnect.net
Not a very reliable system, transmitter keeps resetting to 17:25; locks up. Whole system then requires setting up from scratch. Had a replacement transmitter, no change, and same faults.
GJB"
Perhaps this can help.

Posted on Mar 16, 2008

Ad
  • 15 Answers

SOURCE: We have a newly installed

You have wired the cooling (yellow) and the heating (white) backwards.

Posted on Sep 19, 2008

  • 70 Answers

SOURCE: Installing CM900 Honeywell into Junior 24 Bosch Combi

What kind of boiler are using is this boiler a on the demand electric or gas? You need low voltage wires. If you get me make and model # of off boiler i can try and find wiring diagram . Tell me a little more about you heat system to. Like baseboard heat or in floor how many zones

Posted on Jan 16, 2009

  • 653 Answers

SOURCE: air conditioner stopped working

Check the breaker in the panel and the fuses in the disconnect at the outside unit. If that doesn't do it. call a heating and air technician instead of an electrician.

Posted on Mar 01, 2009

  • 13 Answers

SOURCE: hi,i have a vaillant turbomax

Which turbomax, as there a two different models. The more modern one, with the brass CPL diverter valve, located at the front left of the boiler, was very prone sticking & jamming, this would restrict flow through the hot water circuit in the boiler, and cause cycling. Vaillant actually modified the diverter. You can identify, if it is the old type, as there is a very small hole in the middle of the diverter on the old ones, probable no more than 1mm-2mm wide. The modfied one, is much bigger approx 5mm wide. If old type, replace as this usally sorts the problem

Posted on Mar 03, 2009

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

Hi, I have a baxi solo boiler WM60/4RS and a Landis & Gyr RWB252 timer but my Honeywell T6160 thermostat has nether been connected, can anybody shed light on the wiring connections please.


The color code for thermostat wiring is as follows.
The "R" terminal is power into the stat from the boiler control transformer. Normally 24 volts. The "Y" terminal is for cooling. Normally left blank for a boiler. The "W" terminal is for heat. This one used to start the heating cycle.The "G" terminal is for fan operation. Probably not used for a boiler. Check the boiler terminal board for these functions and write down the wire color on each one. Match the boiler colors to the right function on the stat. If you need more than this, let me know.

Jan 06, 2014 | Honeywell Programmable Thermostat Heater

1 Answer

Can you replace a danfoss TP9 with a honeywell ST699


I believe the TP9 is a programmable thermostat.

While it appears the ST699 is a timer that connects to a thermostat.

So yes, they both control 230Volt boiler-and-pump. But there are differences.
Google search each item and include .pdf in search parameter to find product manual for each, and then compare wiring differences.

Nov 19, 2012 | Honeywell Hardware & Accessories

1 Answer

My timer is set to shut off at a certain time of day, and I want to turn the timer off, but I can't figure out how to do it. Can you send instructions on how to turn the timer off?


Honeywell product is not identified.
More information is needed to identify product. Add a comment with as much information as possible, to help expert locate correct information.

For example Honeywell makes timer controls for boiler and heat-ac units.
Honeywell also makes Aube brand wall and box timers for lights and pumps.
http://waterheatertimer.org/Aube-timers.html

Honeywell has a contact-us page:
https://honeywell.com/Pages/contact-us.aspx

Aug 30, 2011 | Honeywell 24-hour Timer Control 120v Spdt...

1 Answer

My honeywell timer for the back boiler heating is blank


need to contact the people who worked on it yesterday to come back and look at it again because it sounds like you have no power to now.

Jan 29, 2010 | Honeywell CT3600 7 Day Electronic...

1 Answer

WORSTER 550 BOILER TO A HONEYWELL ST9100C TIMER


worcester bosh have there own web site which i think has a technical number you can ring for help

Jan 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Honeywell ST499A/ST699B "Central Heating Microelectronic Time Controller" managing the operation of my house boiler. The time controls are set properly. PROBLEM: If I want either hot water or...


I have an old Honeywell ST499A/ST699B thermostat. It still works OK but when we have a power cut I have to re-programme everything. Presumably this is because the battery needs replacing. I cannot find a way of opening the control box to get into the unit to replace the battery and in any case I’m not sure if the battery is renewable?

Oct 12, 2009 | Honeywell Programmable Thermostat Heater

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

Related Topics:

20 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...