Clicking sound at condenser and air handler

[Jake2212]

Been trying to diagnose why condenser and air handler is making a clicking sound. The condenser is a heat pump. After clicking for a while the clicking stops but the condenser contactor burns out. Any ideas?

[kdean1]

Yes.
Give us specifics. Model, a thing technical that you have measured.

Also have your post moved to the correct forum, the tech to tech forum. Click the little black triangle at the bottom of your post and ask the moderators to move it.

[Jake2212]

The air handler doesn't have a model number but it's a Bryant. I've checked wires for continuity going to the condenser and thermostat. I've checked for 24v going to defrost board and coming off defrost board. I've also checked pressure switches and they was good

[kdean1]

What is the source of the clicking? Fan, relay, refrigerant lines?
What do you mean “the contactor burns out?” That would be my first concern, not the clicking.

[Snapperhead]

bad thermostat ?

if you unhook stat , then from there twist a few wires together to make the unit run …. does it still click

[Jake2212]

The source of the clicking is the contactor and a relay. And what I mean by the contactor burns out is after it clicks for so long the button in the center of the contactor (that allows the high voltage to travel through) it breaks and the contactor is no longer operable

[Jake2212]

The thermostat is good

[Jake2212]

The wiring schematic is calling for the transformer tap to be set on 208v but I noticed the transformer is set to 240v. I'm wondering if that could be the problem

[Snapperhead]

whats your voltage coming in ?

That's what you set the transformer to

[Snapperhead]

usually I find one of the high pressure sensors , or low pressure sensors is culprit

Or bad solder joints on board

Bypass those sensors and see if she still clicks

[Jake2212]

240v coming in. But if the schematic says set the transformer to 208v shouldn't I set it to 208v?

[Jake2212]

The high and low pressure sensors are good. I'm thinking it might be the defrost board

[thatguy]

...

[Snapperhead]

240v coming in. But if the schematic says set the transformer to 208v shouldn't I set it to 208v?

c'mon man .... why do you suppose they have a setting for 240 ....

You wont find a 208 power supply until you get into a commercial building

Set the transformer to the correct power , then make sure you have about 25v at board

If you don't get 25 volts then I guess they know something that we don't and you will have to set it back to where it was

[Snapperhead]

Once in awhile I come across a rooftop unit that's running just fine ....but only has 20 volts at the thermostat. I check power coming into the unit 208 which is landed on the 240 tap so I move it to the 208 tap and I get my 25 volts