[LearnNewSkills]

Hi,
Im working a panasonic econavi hvac heater/ac
This is heater problem right now.
Its got two econavis in the room on 25 amp double pole breaker.
One econavi heater seems to be working fine. But then the other has power but no fan will run and it trips the breaker?

 

[roughneck]

When does it trip the breaker? When the blower starts?
Using a common circuit for multiple indoor units is very common.

 

[LearnNewSkills]

One units blower works and the other units blower won't turn on but the unit has power. It's been working fine for 3 years

 

[roughneck]

When does it trip the breaker?
At 3 years old it should have some sort of warranty left. Can you call the installer back?
I don’t know much about Panasonic other then they bought Sanyo out several years back and then removed them from the US market. Panasonic seems to be one of those minis where there isn’t a lot of technical literature about them.

 

[LearnNewSkills]

A few minutes or so after trying to get it to run. No I can't call the installer back on the one that has to fix it.

 

[roughneck]

Ok, if it trips the breaker you have a short.
Will it still trip if the other unit is turned off?
Use your meter to ring out the high voltage electrical components of the faulty head. You may find your short there.
What’s the model number of this equipment?

 

[LearnNewSkills]

Ok, where do start reading from on my meter? CS-E18RKUAW I was thinking it was a short toobut I don't know where to start probing with multi meter ad what to look for

 

[LearnNewSkills]

Incorrect model number I first put it's actually a CSE12nkuaw

 

[roughneck]

Took a while but found a wiring schematic for that unit here-

https://www.manualslib.com/manual/802453/Panasonic-Cs-Me7qkua.html?page=12#manual

It’ll show you where to start. Let us know what you find.

 

[LearnNewSkills]

Okay thank you. I'm not going to be there till Monday to work on it though. I assumed I'd start with the wires that power the unit I don't even know what type of voltage I'm looking for am I looking for 120?I'm a beginner at reading schemetics.

 

[roughneck]

It’s 208/230 V.
If your not comfortable working with live high voltage you may want to call someone.
You can also check the resistance of the blower and check it for shorts to ground.

 

[LearnNewSkills]

Thanks, I'm comfortable with it I've worked on light electrical before. How do I test for resistance on the blower motor I have to read the scheme and find which colors are doing what?

 

[roughneck]

Blower motor wires are on the CN-FM connector but aren’t well marked as to what wires do what.
It’s will be a variable speed motor.

 

[LearnNewSkills]

Okay thanks I've actually got another extra unit of this and I'm wondering if I can just swap this blower motor part out and it will solve the problem. I'm new to knowing how to testing resistance. I know it's pretty simple but I just haven't done it.

 

[LearnNewSkills]

And you're saying that possibly having a bad blower motor will cause it to Short and trip it?

 

[LearnNewSkills]

Okay I just watched a little how to on how to test resistance I didn't know it was actually ohms also which it makes it confusing. Okay so I'm moving forward now I just need to know which points to probe with my multimeter too measure resistance on the blower motor? I'm also assuming I'm going to have to disconnect the circuit board that the blower motor is wired to? so that I can isolate it to test it properly for resistance?

 

[roughneck]

The CN-FM connector is the blower motor.

 

[LearnNewSkills]

CN-FM is going to be marked I'm assuming on the circuit board huh?
so I'm not going to be able to be in front of it until tomorrow. Thanks

 

[roughneck]

Should be marked.
But as I said previously I’ve never heard of or seen that brand. And never worked on a Panasonic.

 

[LearnNewSkills]

Thanks appreciate it. Looks like though if I locate thisand try to test for resistance and it's soldered to a circuit board I either have to buy a new circuit board or remove and reattach it solder it back?