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I installed a new programmable thermostat replacing the old

Customer Question
one that was not remembering...
I installed a new programmable thermostat replacing the old one that was not remembering the temperature it was set too. and triple checked that all wiring was connected properly and the new thermostat says that it is working but nothing runs on the units cannot even get the fan to turn on with the on setting
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: thermostat as nothing tripped outside and there was no problem with the hvac before installation
JA: Do you plan on doing the work yourself?
Customer: if possible yes
JA: Anything else we should know to help you best?
Customer: its on the sensi wifi thermostat
Submitted: 10 months ago.Category: HVAC
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Answered in 16 minutes by:
12/30/2016
HVAC Technician: airheatman, HVAC Technician replied 10 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,526
Experience: Furnace, A/C and heat pump specialist.
Verified

My name is ***** ***** I am happy to assist you today.Give me a moment to look over your question and gather some information .I may need to get a bit more information from you.

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HVAC Technician: airheatman, HVAC Technician replied 10 months ago

1. Did you turn power off before stating?(If not wires may have touched and blew a little fuse inside furnace or air handler)

2.Tell me what color wire went to what terminal on old and where you put them on new

3.Model on old and new thermostats.

We will go from here.

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Customer reply replied 10 months ago
1. turned the units off at the inside breaker and checked that they were indeed off before beginning to remove the unit.
2 and 3.
old unit Honeywell Chromotherm III.
White wire connected to E and daisy chained with W2
Yellow wire connected to Y1 and daisy chained to W1
Red wire connected to R
Orange wire connected to O
Green Wire connected to G
Blue wire connected to CNew thermostat Sensi by emerson
White wire connected to W/E
Yellow wire connected to Y
Red wire connected to RH
Orange Wire connected to O/B
Green wire connected to G
Blue wire connected to CP.S. went through entire process reversing back to the old thermostat and it did not work either.
Customer reply replied 10 months ago
the red terminal on the old thermostat had a second red wire near the other that was bare and twisted into a circle like it had been attached at one time however there was no direct connection to it when i first opened thermostat cover
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

White should go to W2.Lets change that and then look in air handler for a fuse that may be blown

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Customer reply replied 10 months ago
which unit is the air handler? one outside?
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

INdoor

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Customer reply replied 10 months ago
sigh in my case that under the house.
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

Do you have a volt meter handy.

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HVAC Technician: airheatman, HVAC Technician replied 10 months ago

Check between RH and C and see if we have voltage.If not you will have to go under

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Customer reply replied 10 months ago
no power. so i need to remove the cover to get to the fuses on the inside unit?
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

THat is correct.Most newer units have a control board with a little 3 or 5 amp fuse.If you know or can get model on unit I can tell you where it is.

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HVAC Technician: airheatman, HVAC Technician replied 10 months ago

Generic picture of board

http://i.imgur.com/UxPpnn4.png

Remove fuse to see if blown

http://i.imgur.com/kYe4Epz.png

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Customer reply replied 10 months ago
I opened and found the 3 amp fuse running between the red wire which is not blown it is a model number B3BM-036K-B no circuit board that i can see.
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

Next check transformer for 24v output.

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Customer reply replied 10 months ago
got .7 on it
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

You sure meter is set right? If only 7vac transformer is bad

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HVAC Technician: airheatman, HVAC Technician replied 10 months ago

Meter needs to be AC volts

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Customer reply replied 10 months ago
27.9 volts
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

OK we have to find where we are losing it.Lets see if it is leaving the air handler

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Customer reply replied 10 months ago
found the fuse and it is fine. could just be a bad connection between the line running to the thermostat and the linkage where the line splits off to go to the outside unit. going to cut all those wire back and reconnect see if that fixes it. this linkage is not in a box or anything to protect from moisture when i redo them should i put them in conduit box or at least wrap them in electrical tape?
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

I would reconnect with wire nuts. Also make sure there is not a float switch or condensate pump in circuit between furnace and thermostat that might be breaking circuit.

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HVAC Technician: airheatman, HVAC Technician replied 10 months ago

Update.The more I study the Sensi. I am thinking you may have been correct on the W/E

Most thermostats use W2 to energize heat strips as second stage heat (First stage being the heat pump).

So lets keep the White where it was.

Were you able to find a break anywhere in the circuit from air hander to tstat?

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Customer reply replied 10 months ago
i rewired completely due to the old wire was brittle and I did not want to have to do this again. i wired it up on w2 and it is running do i need to change it back to w/e?
HVAC Technician: airheatman, HVAC Technician replied 10 months ago

AS long as it is working leave it as it is.Most thermostats use W2 as second stage.

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Category: HVAC
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