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Ace 42355 thermostat not coming on

How do i wire an ace 42355 thermostat

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I have two wires coming from my old thermostat (1 black and 1 white), where do I connect these to on my new digital thermostat?


There are way too many types/brands/models of equipment for anyone to answer that question. Pictures and information on your old thermostat, new thermostat and the heater or ac unit it is controlling are going to be a ton of help.

Jan 24, 2016 | Lux Tx500 Series Smart Temp Electronic...

1 Answer

My thermostat isnt kicking on my furnace. even if i use the arrow to increase it, still no heat and it isnt kicking on the furnace. even tried changeing the batteries. sometimes it will say,"return" n


Recheck that the thermostat is wired correctly. If so,switch it to fan on and see if the fan comes on if the fan does not come more then there is definitely an issue with the furnace and not the thermostat.

Feb 15, 2015 | Honeywell RTH221B1000-OB Open Box Basic...

1 Answer

How do I connect the two thermostat wires from a Honeywell R8184G4009 to a programable thermostat. My old thermostat is not marked.


On the Protectorelay Oil Burner Control R8184G4009, you connect the two thermostat wires @ "T" and the other "T". On the ACE Smart Temp Universal programable therostat, connect one wire to "Rh" and the other wire to " "W". Be careful if you are using this thermostat for A/C. In that case, make sure there is no jumper between "Rh" to "Rc".

Feb 02, 2013 | Honeywell Protectorelay Oil Burner Control...

2 Answers

POWER PROB: I have an 85 Gal. Marathon water heater and I'm having some power issues. I have 240 Volts coming into the water heater and on the "upper" element but I only have 120 Volts on the...


It sounds like upper or lower thermostat.
Thermostats turn off one leg (or one wire) in the 240Volt circuit, so each elements will test for 120V even when thermostat is off.
When thermostat turns ON, it closes circuit by adding the second leg to 240V circuit, and element turns ON.
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html#120-240
http://waterheatertimer.org/How-water-heater-thermostat-works.html

Take 30 minutes and troubleshoot before replacing parts:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Jan 11, 2011 | Rheem Water Heaters

1 Answer

Hot water runs out after one shower


You say the hot water runs out after one shower.
You posted under electric heater.

In case you have a gas heater:
With gas heater
, the flame quality could be bad because of restricted air flow or dirty burner, the control valve and thermostat could be bad, the air intake could be clogged, or the water heater is full of sediment and the flame is burning all the time and unable to heat much water.

With electric heater, the lower element is probably burned out and bottom filled with sediment, but thermostats could be bad, or you could have shorted wire.

Narrow down the suspects
If water heater makes some hot water then upper element is working.

Three remaining suspects are upper thermostat, lower thermostat, lower element, and possibly a loose wire

Check screw terminals for signs of burning and loose wires. Especially check lower element.

Let's test lower element.
Turn off power.
Remove both wires from lower element.
Test across both screws with a continuity tester.
Continuity tester is available at hardware store, or you can make one with battery, wire and a flashlight bulb.
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The continuity tester has a battery and when light comes on, it says the circuit is complete.
Test1) Test across both screws on lower element with continuity tester.
If light comes on then element is good, but element has to pass one more test.
Test2) Test each screw on element to any bare metal part of water heater.
If light does NOT come on with second test, then element is good.
Light ON first test. Light OFF second test. Then element is probably good. But test is not fail-proof without using a meter.

I'm betting the lower element is burned out and you need to replace lower element. And you may need to vacuum out the sediment.
http://waterheatertimer.org/How-to-clean-sediment-out-of-electric-water-heater.html

Now if lower element is good, then the easiest thing is to do is replace both thermostats. Buy generic thermostats at hardware store for $25. After replacing both thermostats, the water heater will probably work. If there is still a problem, then the lower element was not as good as test showed, and it should be replaced also.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

If you are still having a problem, answer back and we'll give more details.

Oct 25, 2010 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Installed new upper & lower elements & thermostats, only top htr works


If original problem was caused by sediment burning out lower element, did you clean sediment out of water heater when changing lower element?
Two element water heaters are 240V.
Thermostats cut power on one hot wire, but 240V circuit has 2 hot wires. So lower element has power at all times coming from the red wire.
1) Use ordinary tester or multimeter set to 240V <> test each screw of lower element to bare metal part of water heater. Each screw should show 120V. If there is no power, then upper thermostat is defective, screw on upper thermostat is loose, or red wire between upper and lower parts of water heater is bad.
2) Remove wires from lower element. Use continuity tester or multimeter set to ohms <> test across both screws of element to see if power travels through element <> if element is bad, then continuity tester will not light up and multimeter will show no ohms. Put wires back on element after test.
3) Start with cold water in tank. Turn on water heater & upper element will turn on. Put ear on side of tank to hear if upper element is heating water. Test #3 screw to #2 screw on low left side of thermostat, should read 240V > Test #3 screw to #4 screw on low right side of thermostat, should read 0V.
Put ear on side of tank. When upper element turns off: Test #3 screw to #2 screw on low left side of thermostat, should read 0V > Test #3 screw to #4 screw on low right side of thermostat, should read 240V. If this test shows 0V and 0V, then upper thermostat is bad. If reading is correct, immediately move to next test.
http://waterheatertimer.org/images/Thermostats-numbered-divided-500.jpg
4) Turn temp on lower thermostat to 150. Using ordinary tester or multimeter set to 240V <> Test across both screws of lower element. If there is no reading, and you know element is good from step 2, then lower thermostat is bad, or wire is bad between lower element and lower thermostat, or wire is bad between lower thermostat and top part of heater.
5) Test across both lower thermostat screws, should read 240V.If this test is good, it means wires are good. Put jumper wire across both screws of lower thermostat, and test lower element again. If element finally turns on with jumper wire, then lower thermostat is bad.
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http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

If wire is bad between upper and lower parts of water heater, and water heater has tight-fitting 2" foam insulation, it usually indicates water heater replacement.

Sep 20, 2010 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

No hot water


Have you checked the bottom thermostat for power coming to it and out of it. The thermostat may be bad, that would be the first thing to check. Also check the wires coming out of top thermostat to lower one for power it could be the top not suppling the power.

Jul 12, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have a Halstead High Ace which will not light up the light flickers then goes off we have fitted a new dectection electrode but still will not light the boiler We also have flushed the system out ....


sounds basic, but make sure the electrode is in the pilot flame
check the overheat thermostat is not jammed on
disconnect and join wires together for temporary override check and run boiler.

Nov 14, 2009 | Water Heaters

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