Author Topic: HVAC (heating and AC) question (Read 60927 times)

WayBackMachine · « **Reply #380 on:** August 20, 2023, 11:29:28 AM »

I think the cap is ruled out, I went to the condenser (the outside unit) and clicked in the contactor switch with a screw driver and the unit went on so @ChaimMoskowitz seems to be correct here, additionally the fan should've gone on if the cap would've been the issue,
which makes me think the problem is in the furnace (inside unit), what I know, transformer is good, since the control board is lit up with a zero, and same with the fuse, zero indicates its not getting a signal to turn on from the thermostat, what's the next step to narrow down the issue

WayBackMachine · « **Reply #381 on:** August 20, 2023, 11:30:43 AM »

Quote from: CountValentine on August 20, 2023, 11:26:20 AM

It is 100% impossible for the cap in the outside AC unit to cause any issue with the fuse/transformer inside.

The reason I asked the question about the type of unit this is because it seems it is standard AC compressor outside and furnace inside. If this is the case the cap can be ruled out 100% as a cause for the problems.

fuse transformer were past issues, now it doesn't turn on and I don't know why
there is a cause and effect I'm still trying to figure out the effect

Quote

For instance, 0 means the unit is in standby, Rheem Fault Code 0
Fault: Standby Mode – no thermostat calls, no active faults

CountValentine · « **Reply #382 on:** August 20, 2023, 11:36:05 AM »

Quote from: WayBackMachine on August 20, 2023, 11:30:43 AM

fuse transformer were past issues, now it doesn't turn on and I don't know why
there is a cause and effect I'm still trying to figure out the effect

Quick way to test the blower motor/control board.

WayBackMachine · « **Reply #383 on:** August 20, 2023, 11:36:39 AM »

which one should I buy? they have many variants does it matter?

https://www.kleintools.com/catalog/test-measurement/clamp-meters

CountValentine · « **Reply #384 on:** August 20, 2023, 11:39:38 AM »

You can also test the heat and AC function the same way.

WayBackMachine · « **Reply #385 on:** August 20, 2023, 11:47:03 AM »

thanks @CountValentine for going above and beyond taking your time to respond

in case this question got buried I'm quoting it again

Quote from: WayBackMachine on August 20, 2023, 11:36:39 AM

which one should I buy? they have many variants does it matter?

https://www.kleintools.com/catalog/test-measurement/clamp-meters

WayBackMachine · « **Reply #386 on:** August 20, 2023, 11:50:45 AM »

Chat GPT

Quote

I'd be happy to help you understand the wiring of a furnace and AC control board. The control board is a crucial component that manages the operation of both the furnace and the air conditioning system. It typically controls the blower motor, ignition system, gas valve, thermostat communication, and more.

Keep in mind that the specifics of the wiring can vary based on the make and model of your equipment, and safety precautions should be taken when working with electrical systems. If you're not comfortable with this type of work, it's best to consult a professional HVAC technician.

Here's a general overview of the components you might find on a typical furnace and AC control board and their wiring:

Thermostat Wiring:
The thermostat wires connect to the control board and are usually color-coded:

Red (R or Rc): Power supply from the heating/cooling transformer.
White (W): Controls the heating system (furnace).
Yellow (Y): Controls the cooling system (AC compressor).
Green (G): Controls the blower fan.
Transformers:
There are typically two transformers: one for the furnace (24V) and one for the AC unit (24V). The furnace transformer powers the control board and other furnace components, while the AC transformer powers the AC control circuit.

Blower Motor Wiring:
The control board activates the blower motor based on the thermostat setting. There may be multiple speed options (low, medium, high) for the blower, and each speed corresponds to a different wire.

Gas Valve and Ignition System:
The control board manages the gas valve and ignition system for the furnace. It ensures proper timing and safety during the ignition process.

Safety Switches and Sensors:
Various safety switches and sensors are connected to the control board to ensure safe operation. These might include limit switches, pressure switches, and flame sensors.

AC Compressor Wiring:
The control board manages the AC compressor's operation, including sending the signal to turn it on/off based on the thermostat setting.

Diagnostic LEDs and Terminals:
Modern control boards often have diagnostic LEDs that provide error codes to help diagnose issues. There might also be terminals for connecting various diagnostic tools.

Common (C) Wire:
The common wire provides a continuous 24V power supply to the thermostat, which helps prevent issues with power loss. Not all systems require this wire, but it's becoming more common with modern thermostats.

Please note that the above information is a general guideline and might not cover all possible variations. Always refer to the manufacturer's documentation for your specific equipment to understand the precise wiring and connections. If you're not experienced with HVAC systems, it's recommended to consult a professional technician for any installation, repair, or rewiring work.

CountValentine · « **Reply #387 on:** August 20, 2023, 11:59:10 AM »

Quote from: WayBackMachine on August 20, 2023, 11:47:03 AM

in case this question got buried I'm quoting it again

I am an electronics guy not a HVAC guy. Best I leave it to a HVAC guy to answer that one.
All I have ever used to fix many furnace/AC problems is a standard multi-meter without a capacitor setting.
This video shows testing all three settings (heat, AC, blower on). That will narrow down your current problem.

WayBackMachine · « **Reply #388 on:** August 20, 2023, 02:06:03 PM »

I bypassed the water pan safety switch (which blew last time) and the pump or whatever its called and it works BH

Yo ssi · « **Reply #389 on:** August 20, 2023, 05:19:54 PM »

Quote from: WayBackMachine on August 20, 2023, 02:06:03 PM

I bypassed the .. safety switch .. and it works BH

WayBackMachine · « **Reply #390 on:** August 20, 2023, 05:25:08 PM »

Quote from: Yo ssi on August 20, 2023, 05:19:54 PM

no ones life is at risk, its about water damage, I'll isolate soon the switch and the pump and see which one went bad and replace it, IYH

aygart · « **Reply #391 on:** August 20, 2023, 05:45:45 PM »

Faulty control board is a known common issue with the rheem units from B&R.

WayBackMachine · « **Reply #392 on:** August 20, 2023, 05:48:03 PM »

Quote from: aygart on August 20, 2023, 05:45:45 PM

Faulty control board is a known common issue with the rheem units from B&R.

and whats the solution?
faulty boards explain transformers blewing?
do you believe BR puts in some knock off boards from China, or you believe reheem is trash ?

aygart · « **Reply #393 on:** August 20, 2023, 06:02:25 PM »

Quote from: WayBackMachine on August 20, 2023, 05:48:03 PM

and whats the solution?
faulty boards explain transformers blewing?
do you believe BR puts in some knock off boards from China, or you believe reheem is trash ?

Different units have different known issues.

Alexsei · « **Reply #394 on:** October 31, 2023, 11:29:14 PM »

This is a 4" ac ceiling diffuser, drywall guy did a sloppy job, is there some kind of product I can easily install between the diffuser and the ceiling to cover up the hole instead of patching the drywall?

somefield · « **Reply #395 on:** November 01, 2023, 09:27:24 AM »

Primex makes a diffuser collar for this exact issue.

Alexsei · « **Reply #396 on:** November 01, 2023, 09:28:42 AM »

Quote from: somefield on November 01, 2023, 09:27:24 AM

Primex makes a diffuser collar for this exact issue.

.Thanks, link?

Wolf Pack · « **Reply #397 on:** November 06, 2023, 07:29:48 PM »

Is it complicated to replace the control board on a Rheem Classic 80 unit? Can I do it on my own?

CountValentine · « **Reply #398 on:** November 06, 2023, 07:51:40 PM »

Quote from: Wolf Pack on November 06, 2023, 07:29:48 PM

Is it complicated to replace the control board on a Rheem Classic 80 unit? Can I do it on my own?

Is this a furnace? Do you have model number. Replacing control boards is pretty straight forward. How do you know it is the control board?

Wolf Pack · « **Reply #399 on:** November 06, 2023, 08:43:59 PM »

Quote from: CountValentine on November 06, 2023, 07:51:40 PM

Is this a furnace? Do you have model number. Replacing control boards is pretty straight forward. How do you know it is the control board?

Yes, it is a furnace. A tech I called down told me the issue is the control board got water damaged, wanted $600 to replace. I can also see some water damage on the board itself.

RHEEM PT# 62-24140-04

Rheem Classic quite 80