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I have a Noma THM501 thermostat. The `System On (Heat)`indication continues to flash. What does this flashing indication mean.

Details are above.. thanks.

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The manual that came with unit will explain the significance of the flashing icon. Should be in a steady state condition.

Posted on Dec 23, 2016

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The flashing may indicate the need for battery replacement.

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The unit keeps flashing


By unit, do you mean the thermostat? And if so, do you mean the whole face is flashing, or just a heat or cool symbol? And if your talking about the heating/cooling unit, are you talking about a flash on the board?
A thermostat face that is flashing is usually batteries.
A symbol that is flashing on a thermostat indicates a call and is in a delay. There will be a 5 minute delay on calls if the call has been short cycled, powered off and on, etc.
If the symbol continues to flash for an extended amount of time, then the problem is in the furnace, air handler, etc.
If the system is working, but flashing, then it could be the programming of the thermostat.

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1 Answer

We have a White-Rodgers 90 series thermostat that started beeping last night. We have had it for about 4 years. Does it have a battery? I couldn't find anything about that in the manual.


Susan, the "90" series of thermostats covers a couple of different thermostats made by White-Rodgers. Here's how to find your model number. With that info, I can check the manual specific to your thermostat.

In the mean time, check the display for the word BATTERY or BAT. (Flashing) on the display. Battery flashing or blinking on the digital display indicates low batteries. If the batteries have recently been changed and the thermostat continues to indicate low batteries, use a pencil eraser to polish each of the battery contacts inside the back of the thermostat. Do not bend them up and down when polishing or you might break them. When complete, they should all be as shiny as a mirror. This will assure proper battery back-up, allow the backlight to work correctly and remove the flashing battery symbol from the screen. Battery (Solid) on Display The battery symbol (not blinking) indicates a loss of power (24 volts) from the heating and cooling equipment to the thermostat. Normally the heating and cooling do not operate when the battery indicator is on. If the battery indicator is on, check the fuses or breakers, make sure the furnace is switched on, and verify the blower compartment door is closed properly. The battery display is designed to indicate the thermostat is running on batteries, so replacing batteries has no effect on the indicator. See No Heat/No Cool for more information. Note: Some heat only systems (zoned systems) disconnect power from the thermostat during a normal heating cycle and display the battery symbol. Millivolt heating systems always indicate battery because they do not supply 24 volts to the thermostat.

A beep often is provided as audible feedback when keys are depressed on many thermostats. You should check to make sure that no key is stuck in the "in" position or is otherwise activated.

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1 Answer

How to reprogram my Woods N1506 Timer


Manual and image for Woods/Noma N1506 outdoor timer
http://waterheatertimer.org/Woods-timers-and-manuals.html#N1506

SETTING NOMA N1506 TIMER

Plug in timer - The letter C will Flash

TO SET CURRENT TIME:
Press Time Button - It will advance to 1 a.m.
Continue pressing until right time to the nearest hour.
Timer is only set to nearest hour.
(NOTE: A dot at the bottom right corner of the display indicates P.M. hours).

TO SET ON AND OFF TIMES FOR TIMER OPERATIONS:
Press Mode button - Letter P will flash inviting you to set the program
Press Time button repeatedly until required staring time appears in the window. (starting time is now displayed).
Press Mode button again - the letter E now flashes.
Press time button repeatedly until required ending time appears in the window. (Note: a dot at the bottom right corner of the display indicates P.M.hours).
Press Mode button and the display returns to the current time.

Programming is now complete. You may now plug in whatever needs to be turned on. The device will turn on and off automatically every day at the times you have just selected.

TO REVIEW THE PROGRAM
Press time button - Displays successively, for 1-2 seconds each: P, starting hour and E, ending hour. Then returns to show the current time..

TO CHANGE YOUR PROGRAM
Unplug the timer, which will discontinue the current program. After 10 seconds, plug it in again and proceed to set current time. Then continue with the programming steps as above.

FOR MANUAL OVERRIDE
Pressing the Mode button at any time will turn on the devices plugged into the timer. The display will indicate the letter O. The devices will remain on until the ending time of the daily program. To return the timer to the automatic mode prior to that hour, press the Mode button again. The display will return to show the current time.

AFTER A POWER INTERRUPTION/FAILURE
The timer will return to displaying a flashing C and the devices plugged into it will be off.

Dec 13, 2010 | Woods Outdoor Lighting Timer

1 Answer

How to program my Woods N1506


Manual and image for Woods/Noma N1506 outdoor timer
http://waterheatertimer.org/Woods-timers-and-manuals.html#N1506

SETTING NOMA N1506 TIMER

Plug in timer - The letter C will Flash

TO SET CURRENT TIME:
Press Time Button - It will advance to 1 a.m.
Continue pressing until right time to the nearest hour.
Timer is only set to nearest hour.
(NOTE: A dot at the bottom right corner of the display indicates P.M. hours).

TO SET ON AND OFF TIMES FOR TIMER OPERATIONS:
Press Mode button - Letter P will flash inviting you to set the program
Press Time button repeatedly until required staring time appears in the window. (starting time is now displayed).
Press Mode button again - the letter E now flashes.
Press time button repeatedly until required ending time appears in the window. (Note: a dot at the bottom right corner of the display indicates P.M.hours).
Press Mode button and the display returns to the current time.

Programming is now complete. You may now plug in whatever needs to be turned on. The device will turn on and off automatically every day at the times you have just selected.

TO REVIEW THE PROGRAM
Press time button - Displays successively, for 1-2 seconds each: P, starting hour and E, ending hour. Then returns to show the current time..

TO CHANGE YOUR PROGRAM
Unplug the timer, which will discontinue the current program. After 10 seconds, plug it in again and proceed to set current time. Then continue with the programming steps as above.

FOR MANUAL OVERRIDE
Pressing the Mode button at any time will turn on the devices plugged into the timer. The display will indicate the letter O. The devices will remain on until the ending time of the daily program. To return the timer to the automatic mode prior to that hour, press the Mode button again. The display will return to show the current time.

AFTER A POWER INTERRUPTION/FAILURE
The timer will return to displaying a flashing C and the devices plugged into it will be off.

Dec 13, 2010 | Woods Hardware & Accessories

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