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If i give power to furnace,will thermostat work it in a power outage ? The system is 40yrs. old . the thermostat is a round dial type. Williamson : Temp-o-matic furnace and thermostat

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It should. the transformer,110v to 24v should be part of a 40 yo furnace. if not just find that tranformer and add power to it also

Posted on Mar 23, 2011

Testimonial: "It works just the way it should. I put a plug in so i can unhook it from the main line when the power go's out and use the generator . No backfeed ."

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My furnace is an older type furnace and it was working fine yesterday but the blower won't shut off after it runs for a while it run continueally I was wondering what I could do to fix this pr


When you say 'older furnace' I am assuming old enough to where there is no circuit board. They will usually have a thermally activated 'fan-limit' switch with a bi-metal sensing device. Most older furnaces had either a Honeywell or a White-Rodgers controller and they look almost identical. With the furnace door off, look towards the top of the furnace vestibule (above the flame area) for a rectangular box approximately 3 1/2" wide by 5" long. Tap the side of the box with a screwdriver and if the thermostat setpoint has been satisfied and the gas burners have been off for more than three minutes, the fan should then shut off. The switch contacts are either stuck together OR the bimetal sensing device is weakening from thousands of cycles.

If it continues to run, squeeze the sides of the 'lid' of the box and remove the cover. Inside you'll see a round moveable dial with three pointers, marked 'fan off, fan on, and limit'. The 'limit' should remain at or near the 200 degree setting, the 'fan on' can be anywhere around 140 and the 'fan off' can be anywhere near 100 degrees. It is the 'fan off' position thats giving you the grief.

Turn the thermostat up again and sit there and watch the dial do its thing and yo'll understand better how this control works. Watch it rotate past the 'fan on' setting and observe the fan turn on. Turn the thermostat below room temperature and watch the gas shut off and the dial rotate back towards the 'fan off' setting. If it hangs up again before twisting past the setpoint, you can slightly increase the setting to compensate for the weakening bi-metal element. But just a tiny bit, not a great amount or you will have the fan shutting off with a lot of residual heat still in the heat exchanger. The idea of the delay in shutting off the fan is to remove all that residual heat and transfer it to the house.

There are other brands that utilized 'timed on' fan controls, and there are a few other variances of controllers but what's described above should cover the vast majority of older furnaces.

Remember there is ELECTRICITY inside the fan control and any adjustments should be done with the power OFF !!!!

Dec 26, 2014 | Heating & Cooling

1 Answer

How can I modify wiring to solve a generator related problem?


A common is basically a ground. If you had to you could run your common to an electric outlet on the ground wire. Not recommended but I have done it and it will work. I'm a southern a/c guy with no oil furnace experience but if your furnace isn't sending 24 volts to the tstat it's not going to matter if it has a common because you will have lost your 24 volts when your a/c is off. If your furnace does send 24 volts to the tstat then I don't see why you could not get the common from the same spot, even if you run your common straight to ground. Good Luck

Mar 09, 2017 | Heating & Cooling

1 Answer

Bosch GL4ti Ariston water heater - have no hot water is it worth fixing or should I replace? Also, is the reset button different from the on/off switch?


Check if unit has power to the plug. If so, could be bad heater element or bad thermostat. Also could be reset button on thermostat and yes, the reset button is different from on/off switch. Element about $38, thermostat about $30 from www.plumbingsupply.com

Occasionally, the high temperature limit shut off device may trigger and shut the

system down. This occurs when water temperature exceeds 190° F and shuts off

power to the heating element. The shut off device may also trigger from a power

outage or electrical storm.

To reach the thermostat:

1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with

a small flat-head screwdriver.

2. Remove the Phillips screw revealed beneath the round cover plate.

3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When

reassembling, work in the opposite way being careful to insert the tongue of the

cover into the slot.

4. Firmly press reset button (B Fig. 4). Reconnect power.

5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from

high to low, if the red light does not go off on low setting, turn off power supply and

call a service person to replace the thermostat.

6. If the system works, place dial setting to desired setting. Note: a lower setting is

more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.


PlumbingSupply.com has the Ariston repair parts that you need.
ariston-gl2546components.png Diagram # Model # Description Price & Quantity 2 570241 Anode Rod for GL6 and GL8Ti $13.99 2 574305 New Style Anode Rod for GL2.5 and 4.0 $12.95 3 994147 Element Gasket $11.95 4 994140 Element Locknut - 4 Each Req. Per Element - sold each $2.99 5 994103 Element for GL2.5 and GL4.0 $37.95 5 994104 Element for GL6 $39.97 11 65105602
old #994062 Thermostat for GL2.5 and GL4.0 $29.52 11 65150322
old #994102 Thermostat for GL6 $32.57 GL25-4KIT Element, Element Gasket and Anode Rod Kit - For GL2.5Ti & GL4.0Ti $47.65 GL6-8KIT Element, Element Gasket and Anode Rod Kit - For GL6 & GL8Ti $48.65 Note: If you don't see your number unfortunately it is no longer available

Feb 02, 2010 | Bosch GL4Ti Ariston Pro Ti Electric...

1 Answer

Honeywell thermostat TH6110D1021. Blower comes on


Hi, You are right, fan is on a time delay in the heating cycle, and after burners fire that is when this delay comes into play. You have a preset factory temperature that determines the cycle on time for the fan, and the off time after the burners shut down also. This will not be in the thermostat, but in the fan/limit control the is mounted on the face of the furnace, with a probe inserted into the fire box.Depending on how old or new this unit is, will depend on the type control you have.It may be just a high limit switch, or the 1st I mentioned.If so, It rotates in the burner as the temperature rises, to turn the fan on and off.Disconnect power, remove cover, and 2 screws.Slowly remove the control and gently clean the probe. Turn the dial if this one has it and you will be able to hear it click. This click is contacts closing to start fan operation.Reinsert and try again. If problem continues, you will have to replace it.They do tend to stick closed/on, in the heat cycle from time to time and a cleaning sometimes will solve this problem. Not knowing how old this furnace is and type, make it difficult to give you a correct diagnosis, so check this fan control as I have explained, and if your system is of a different type, please let me no so I can correct this problem. Sincerely,
Shastalaker7

Dec 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I want to replace programmable thermostat with old dial style


The terminals should be the same on both thermostats, except for C- common.
R- usually RED, goes to hot side of transformer,
W- usually WHITE, goes to heat
Y- usually YELLOW goes to outdoor unit
G- usually GREEN goes to furnace blower
Any of the other wires just cap them off you don't need them. If you have an Rh and Rc terminal instead of R and don't have them on the programmable then put a jumper from Rh ro Rc.
If you need more, then let me know what terminals you have on both t'stats and brand of furnace and AC, if you have a heatpump then there's more wires let me know.

Oct 13, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Honeywell round thermostat Model #T87F continuously running


you either have 2 thermostat wires bare and touching or a zone valve stuck open

Feb 28, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Wc wiring on thermostat


sounds like you have a heat pump the w2 on old thermostat is for a second stage heat. If you can give me a little more information on type of system you have (forced air furnace with heat/cool, Heat pump or boiler)? How many wires are on old thermostat? Is it a no programmable or programmable? How old is the furnace?

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell dial theromostat.


since you say it has a blank face it must be a digital thermostat. if the power is on to the furnace and the furnace door is on (door switch) and still does not give you a reading. You probably have a bad stat. if you are handy.... unhook the wires in the thermostat. jump the red and white wires together. the furnace should turn on. if it does the thermostat is bad. if it does not turn on its not the thermostat its the furnace

Oct 07, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace thermostat


Get to the wiring at the thermostat. Take a small jumber wire and jump from R to G on the thermostat. Hold it there a few minutes to see if the system starts heating. If it does, you have a bad thermostat. If not, you have other issues.

Jan 18, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

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