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@ -223,7 +223,23 @@ Other:
| EEVP | EEV position |
| HP | heat pump |
## Appendix B: Diagnostic and status messages
## Appendix B: LEDs
**LEDs allow you to make rapid diagnostics without connecting a serial console or a Service Display. **
| LED | description |
| ------------- | ------------- |
| **EEV_opening** | EEV is opening |
| **EEV_closing** | EEV is closing |
| **EEV_fast** | EEV mode is "fast" (non-precise) |
| **485_RX** | 485 transceiver is in listening state |
| **485_TX** | 485 transceiver transmits a reply |
| **Manual mode** | EEV in a manual mode |
| **LSC: error** | Last stop was caused by an error. If you see this LED ON, it's a reason to connect either console or Service Display. Diagnostics required. |
| **LSC: protection** | Last stop was caused by protection. In some conditions (like long powered-on periods or refilling) this can occur. This LED indicates that something exceeded normal run conditions. |
| **OK** | System OK. |
| **ERROR** | Something wrong: not all T sensors connected, one of the pressure sensors is not OK. Diagnostics required. |
| **Relays LEDs** | Indicates corresponding relay state |
## Appendix C: Diagnostic and status messages
**LastStopCause (LSC) messages. Why the compressor has stopped working.**
| Message | description |
| ------------- | ------------- |
@ -277,7 +293,7 @@ Other:
| **HWP_ON** | Hot side pump powered on. |
| **Err:_errorcode_** | Error code: 1 = temperature sensor error, 2 = Hot side pressure too high, 3 = cold side pressure too low. |
## Appendix C: secret appendix
## Appendix D: secret appendix
Are you still reading? It seems you are interested in Heat Pumps, so this appendix is for you.<br>
About sensors: avoid using cheap "waterproof epoxy-covered" sensors. "Waterproof" lasts for a short time.<br>
Buy DS18B20s chips. No matter what sensors are buying: cheap or at a high price. I've never seen "bad" DSes. Solder sensors to the wires and cover with two layers of 2-component epoxy resin as pictured below. It will work for years. White/orange - GND, white/blue - signal, orange - +5V.<br>
@ -299,7 +315,7 @@ Overall, your system with sensor locations will look like at a scheme below. Ref
<img src="./m_Valden_Heat_Pump_Controller_model.jpg" width="1000"><br><br>
Your system works (or sleeps) depending on Thi temperature. For the end user it looks like setting up comfortable temperature of the warm floor via Remote Display.
## Appendix D: Firmware options and fine-tuning
## Appendix E: Firmware options and fine-tuning
QA tests, uncomment to enable
```c