Pioneer vsx-454 what is the "largest" speaker this amp will work with?

SOURCE: pioneer receiver vsx d814 amp error

The Pioneer VSX-D814 has a couple of Power Hybrid bricks that do all the power amplification. These are the infamous PAC011A. You should have 2 of those in your receiver.

If the amp detects some unusual activities, it may shut down the unit to prevent damage. “Amp Err” usually means some DC in the output.

Disconnect all the speakers and turn on the unit; if it acts normal, reconnect speakers one set at a time very carefully. If the unit still shows the error message you can try to reset it. If the reset works, again carefully reconnect the speakers connections. If the reset does not recover the normal operation of the unit, you may have one of the PAC011A damaged, and the unit will need repair.
The reset can be done by disconnecting the unit power cord for a few minutes, then plug it in and press “FRONT ENTER key + ADVANCED SURROUND key” continuously for 2sec.

Good luck

SOURCE: Pioneer VSX-454 Receiver

ANY NEW universal REMOTE MADE 1984-2001

SOURCE: Pioneer VSX-D411 receiver "Amp Error" message

Hello,
Unfortunatelly your receiver has failed. The front panel is telling you one of the power modules is probably bad. Not an DIY type of repair. These parts are near $40.00, plus cost of replacing.
Look at options to replace your trusted receiver with a new one.
Good luck

SOURCE: pioneer vsx-519 no sound from center and surround

Make sure that the sound field/programme you have selected is dolby digital not stereo.(On the amp)
You also need to check on the display that is says DIGITAL not ANOLOUGE, as only a digital input, Optical fibre cable, HDMI, COAX will be a digital signal.
If you are using red and white rca connectors, it is not going to work, as this is an Anolouge signal.

SOURCE: pioneer receiver vsx-d510 sub not working

Rear Surrounds are not supported on this unit, they would be the 6th and 7th channels in a 7.1 rig. I think you mean Surrounds (channels 4 and 5 in a 5.1 rig).

Lets ponder: How is there any relationship between Surrounds and your separately-amplified Subwoofer? I don't see it, unless you inadvertently chose OFF for the Sub definition when you were in the Speaker selection menus adding the Surrounds. Look again.