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I have an lennox Hvac unit which just stop getting power.

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the red & green light...
I have an lennox Hvac unit which just stop getting power. the red & green light are both off. i changed tge capacitor & still. i do have power coming into the unit, measured at the contact.
Submitted: 2 years ago.Category: HVAC
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Answered in 1 minute by:
11/24/2015
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,767
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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hello,

some Lennox units have a small black rocker switch on the metal panel to the right of the circuit board. Have you checked this small rocker switch to reset?

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Customer reply replied 2 years ago
do you have a pic? I do have a pull out cut off power plug on the side of the house connected to the unit
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

what is your model number?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

that is an ac coil on the furnace. Can you remove both doors of furnace...take pic...and post?

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Customer reply replied 2 years ago
I changed the capacitor & still
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok I understand now...

The power to the unit...have you checked it with a meter? Is it 230 volt?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

if you press the center bar of contactor in does unit do anything?

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Customer reply replied 2 years ago
lol Im still a novice.. touch it with what?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

a pencil, screwdriver stick....we want to just press the spring loaded center of the contactor down

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Customer reply replied 2 years ago
ok gimme a sec
Customer reply replied 2 years ago
the fan comes on
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

thank you...so we are missing the signal from inside...does the indoor blower turn on inside the house?

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Customer reply replied 2 years ago
i will need to hold the center down and ask my wife it kicks in correct?
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

no....inside the house is a blower unit...if you set the thermostat to fan on...does the indoor blower run in the house?

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Customer reply replied 2 years ago
oh ok no..
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

that is where we need to start,,,it is the signal that starts at blower unit..goes to thermostat and then to outdoor unit. Do you know where your indoor blower is?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

can you see if the breaker is on to the indoor unit? Also I see you have a zoned system so you have more than one thermostat?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok,

the issue is inside this unit.

This is 220v also...do you have a meter to test this unit?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok...set volts~ 750....then we need to test main power to this appliance..hot wire to hot wire...not hot wire to ground

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Customer reply replied 2 years ago
ok gimme a sec ima take panel off
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

put the meter leads on the 2 terminals where the 2 black wires are on right side.

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Customer reply replied 2 years ago
ok i got 243
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

now the left side where it leaves

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Customer reply replied 2 years ago
same 243
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok, to the left of what you just tested is a transformer..brass color cube.

This takes 243 in one side and supposed to have 24v the other side.

Can you test this?

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Customer reply replied 2 years ago
white & orange?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

the opposite side...what are terminals? we will just test output..

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

excellent...one meter lead on blue wire terminal and the other meter lead on the brown wire terminal.

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Customer reply replied 2 years ago
i got a spark
Customer reply replied 2 years ago
n break trip
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

just by putting meter leads on?

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Customer reply replied 2 years ago
yeah now the breaker is out reading 0
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

the side we are testing is only 24 v..the breaker is 240v.

reset the breaker...then carefully test the 2 terminals again...the only thing that could trip breaker is if a bare wire touched ground

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Customer reply replied 2 years ago
i had to reset the breaker in garage
Customer reply replied 2 years ago
0k got 26
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

good.

this means we have main power and we have control power. But the zone panel is not closing signal for the equipment.....you still game to go into the zone panel up at top marked Honeywell?

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Customer reply replied 2 years ago
lets do it! lol
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

remove cover...on left side towards bottom is a block with R and C.

we need to test those 2 terminals...meter lead on each

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Customer reply replied 2 years ago
i got 24
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

thank you

now above that is Equipment module..put meter red lead on RC/RH and the meter black lead down on the C tested previously

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Customer reply replied 2 years ago
i got 1
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok, we have narrowed this down alot and are ready for the final tests...do you have or can make a strip of wire 4-5" long with the ends stripped?

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Customer reply replied 2 years ago
gimme a few ima go to thegarage
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

excellent....the Equipment block...one end of wire on Rc/Rh (either one) and the other end of wire touching G...tell me if blower kicks on

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Customer reply replied 2 years ago
no response
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok we have the 2 end points with issue in between...follow the wire from the Equipment block Rc/rh....where does it go or end?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

that switch in pan is likely breech. wire from rc/rh runs to this switch..then from switch does it go to transformer? almost there...

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

ok, we have a bad wet switch...or a bad time delay relay (black box).

cut the wet switch wires and wire nut together or twist and tape.

then jump rc/rh to g again at equipment block.......This is last test

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

yes...basically we just want to pretend that switch was never there...

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

that was it....go ahead and press next.

You have a bad wet switch...is anything starting to kick on yet?

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Customer reply replied 2 years ago
not yet i did the wire jump n no response.( u think the transformer spark earlier may need to be replace as well)
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

It would not hurt at all as you never know when compromised.

So we know:

Outdoor unit has power

Indoor unit has main power

Indoor unit transformer works with 24v

Zone board gets 24v from remote transformer

Everything is in place except for the wet switch is bad and you have a purge delay.

Now at thermostats..turn all off but turn fan switch to on.

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Customer reply replied 2 years ago
i try it
Customer reply replied 2 years ago
nothing happens
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

and rc to G on equipment block did not work either?

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Customer reply replied 2 years ago
none worked so far
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

I am very sorry but I have to go offline. Is it possible to continue tomorrow or would you like me to transfer to an online tech?

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Customer reply replied 2 years ago
what time tomorrow?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

anytime you respond I will be notified. I am scheduled for 10-12 and 5-10

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Customer reply replied 2 years ago
ok 10 am eastern?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

yes

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Customer reply replied 2 years ago
ok i will respond at 10 am sharp! thansk!
Customer reply replied 2 years ago
you back?
Customer reply replied 2 years ago
hello
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago

I am sorry, whether it is sickness or deer hunting I was short techs today. I do not know quite yet when I can get back on so I will release the question so that anyone can assist.

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Customer reply replied 2 years ago
can so one respond?
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