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Wiring a boiler. honeywell L8124A, C and aYr845a t stat calls for heat the circulators run but the boiler doesn'T FIRE what am i missing

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SOURCE: I have a coleman evcon

The most common wiring is: This sometimes varies as to installers preferance.
Red wire is your supply power to the T-stat. R terminal
Green wire is the blower fan. G terminal
Yellow wire is compressor contactor Y terminal
older units used a blue wire to Y
White wire is heat auxilary or black wire W terminal
Orange wire is reversing valve O terminal
Blue wire is the common C terminal
Black wire can be emergency heat E terminal
Best thing to do is replace wire for wire from t-stat to t-stat
or write down the colors to which terminal on the old t-stat and match to the new. make sure you SECURE POWER to the Air Handler, furnace and condenser before replacing any t-stat.
It is very easy to short the wires out if the power is left on and take out your A/H low voltage fuse or transformer.

Posted on May 18, 2008

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SOURCE: keston c40 honeywel 9400c programmer

do a s plan plus and buy a poly plumb roomstat combined programer with built in relays as you require the relays to stop back feed! simple!

Posted on Jul 23, 2008

  • 234 Answers

SOURCE: what would the correct high and lo and diff

I would say high if you need cooling. If the tempature is cool enough for you then set it to low.If you are hot and need more cooling then high.

Posted on Apr 07, 2009

SOURCE: Replaced Bryant T-stat model TSTATBBNB001 with Honeywell t-stat

Hello,You forgot to wire the O terminal w1 witch is the reversing valve.It is important to check if old stat is using O or B in witch case B terminal=w1 leaving O unused.

Posted on Apr 21, 2010

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Hi I have a hb2400vd2m20 air handler and need to know what wires are needed to hook up to my thermostat its a Honeywell, as of the moment there is no heat pump it just the air handler running. I know there...


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I have a vulcan continental boiler , heating system , and its not fireing up , i think there is air in the system , whats the best way in to bleeding it out ?


Air in what system?--
The Circulating 'Hot' water?-- or in the fuel? (What kind of fuel?)

Normally a hot water boiler will fire, as long as ther is water in the boiler,
So-- are you suspecting there is Low water in the boiler?
Can yo hear the water circulating thru the water pump?-- is the water pump running?

Tell us more about what happens when you first give it a call for heat?
Do any fans or valve try to start?-- any indicator lights?

Tell us some of the obvious things, and maybe there is a clue in something you tell us or observe.

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1 Answer

Ferroli optimax he 31c. brand new system will only heat 3 of 8 rads. boiler on 90c will only burn for 15sec then D2 shows and it cuts out. Why??


it is either your pump is not running or blocked [ debris from installation ect ] or your diverter valve is stuck partially open allowing a little water to pass into the heating system [ usually first rads on system ] it runs for a short while and cuts out because your overheat stat is kicking in because of poor circulation [ it is only running around the primarys in the boiler where it quickly reaches the over heat limit ] temp tends to rise approx 1 deg per second a clear indication of circulation problems.
solution GET RID OF THE FERROLI

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1 Answer

I have 2 seperate controls ,1 for heat the old honeywell round turn styls and then i bought a new digital thermostat ritetemp and i have 3 wires for the airconditioner white,red and green, i just cant...


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1 Answer

What would the correct high and lo and diff settings for the Honeywell L8124A Aquastat I have a wood fired boiler with the oil fired boiler side by sides,


I would say high if you need cooling. If the tempature is cool enough for you then set it to low.If you are hot and need more cooling then high.

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1 Answer

Gas Boiler will supply /fire up to supply Central heating When Room thermastat turned up and switched to Heating and Hot water. When on Hot water Only will not fire up even though thermostat on hot water...


most likly or a shorted wire unhook the wire from the boiler see if it stops then if it's still is on it's in the boiler if off try unhooking it at the t-stat on the heater this should narrow it down for you dan

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