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Power flashed on and off before going off altogether. Now Honeywell ST699 clock is running to fast, Time dots flashing very quickly, clock gained 2hrs in less than an hour.

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2 Answers

The 2 flashes on the screen and the furnace will not turn on. The 2 indicates the time frame program which is correct but why flashing? Owners manual does not address.


I had two flashes on a Honeywell 8670 continuous retry controller to my Burnham power vent natural gas furnace.In my furnace the two flashes meant the last attempt at starting failed and it was going to retry in 90 seconds.

In my case the furnace actually had two intermittent problems with similar codes. The first issue was the high voltage pilot light cable was also a combination flame sensor wire. The cable was supposed to clamp on to the pilot assembly like a spark plug wire.

When it was installed the clamping bits were too far apart and some fool decided since it wasn't sticking he would glue it on. This worked initially, but later the connection was only good enough to pass the high voltage not the low current DC signal back to the controller indicating the flame started successfully. Flames conduct a small amount of electricity due to ionization and the controller senses this.

I pinched the clamping bits together with some pliers. Then it fit tight and kept working.

Other reasons for the 2 flash code on my controller might be no gas or pilot light failure.

My other problem was a partially failed capacitor on my power vent motor caused the vent fan to run in reverse on say one in one hundred start attempts. Once it started running in reverse it wouldn't run forward without stopping it completely, which took several minutes of off time. The capacitor was available quickly and inexpensively from McMaster Carr.

Jan 10, 2015 | Heating & Cooling

1 Answer

Snow icon flashing


that mean t stat in cool time delay up to five min when snowflake stays on with out flashing cool is running

Jun 01, 2014 | Honeywell Rth110b Horizontal Digital...

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

Hi - after a power cut the clock on the display of C27 timer has not come on so there is no power going to it. I cannot find a separate fuse going into it - does the Honeywell C27 have the fuse inside it....


Press the SET and CH buttons at the same time. The 2 outside buttons. This will restore the factory presets. Then she should be able to program the timer.

Kelly

Jan 30, 2011 | Honeywell Heating & Cooling

1 Answer

Model G51MP-48C-110-6; I've downloaded a manual and troubleshooting is usually fun for me, but ;( this time. It ran fine last year, not this fall. Have alternating Green & Red code lights (FAST); I...


Apply power to the inducer motor, or check the voltage to it first.a relay or circuit board will control its operation, if the inducers not running, the pressure switch wont close and no operation .

Nov 01, 2010 | Heating & Cooling

1 Answer

Our honeywell ultrastat thermostat screen flashes and goes blank. Then we reset the power via the electric box and it works for about 15 minutes and goes out again.


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

May 29, 2010 | Heating & Cooling

1 Answer

My Honeywell EMM-3 zone controller system LED is flashing orange, indicating DAT fault. How do I verify the DAT is faulty?


Hi

Thanks for using FixYa. Perofrm this test--

Connect DATS Sensor to EMM-3 (optional).
a. Reconnect power to EMM-3.
b. If system is in Purge mode, press PURGE OVERRIDE on EMM3.
c. Verify SYSTEM LED is no longer flashing. This confirms proper DATS operation. (Flashing occurs in Idle and Fan modes only.)

Also see page# 9 & 10 from this link--

Honeywell EMM-3 zone controller

Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks
Rylee

Aug 28, 2009 | Heating & Cooling

1 Answer

I have a honeywell ST699B controller for my central heating & water, i walked past it today and the light that indictes the water is on was illuminated. The water is set to come on once a day but not...


i have an st699 programmer its set to go on twice a day heating up but when the wife gets up after ive gone to work the timer is not at the correct time so no heating any ideas as new ones expensive to buy

Jun 25, 2008 | Heating & Cooling

5 Answers

I have a Honeywell T8131C programmable thermostat. Our power went out yesterday, and now the "Bat Lo" won't go away. We replaced the batteries, but the "Bat Lo" indicator stayed on...


I tried all the tricks mentioned previously to no avail.

These are the steps I performed to get it to work:

1. Remove batteries and make sure the battery contacts inside the unit are clean.

2. Disconnect all the wires from the back of the unit. Be careful not let any of the bare wire ends to come in contact with each other. Make sure you mark the wires or verify that the color code matches the markings on the rear cover:
W=White wire;
Y=Yellow wire;
G=Green wire;
R=Red wire (low voltage DC); and
C=Common (wire color varies)

3. Leave the unit disconnected with batteries removed for about an hour to make sure all the memory drains. I waited an hour, but it may not require that much time.

4. Install the batteries in the correct positions per the instructions. The unit should perform a power up display test, then the display will flash the time and temperature.

5. Set the clock and the display will stop flashing.

6. Slide the switch to cool and/or heat and program the desired weekday/weekend settings.

7. Slide the switch back to off once all weekday/weekend settings are made.

8. Reconnect the wires that were removed in step 2.

9. System should be operational at this time.

May 29, 2008 | Heating & Cooling

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