| 1801 | EXPANSION I/O expansion unit POST error. |
| 1810 | EXPANSION Enable/Disable failure. |
| 1811 | EXPANSION Extender card warp test failed (disabled). |
| 1812 | EXPANSION High order address lines failure (disabled). |
| 1813 | EXPANSION Wait state failure (disabled). If 3278/79 adapter or /370 adapter installed check for down level Extender Adapter (ECA011). |
| 1814 | EXPANSION Enable/Disable could not be set on. |
| 1815 | EXPANSION Wait state failure (disabled). |
| 1816 | EXPANSION Extender card warp test failed (enabled). |
| 1817 | EXPANSION High order address lines failure (enabled). |
| 1818 | EXPANSION Disable not functioning. |
| 1819 | EXPANSION Wait request switch not set correctly. |
| 1820 | EXPANSION Receiver card wrap test failure. |
| 1821 | EXPANSION Receiver high order address lines failure. |