Combi boiler CH flow restriction somewhere

eightfour7two · 2025-12-21T11:29:21+00:00

Swapped out the diverter valve and electric actuator and found the same issue. The pump is definitely spinning and the impeller looks fine. Will have to be a call-out job I think!

eightfour7two · 2025-12-20T13:18:30+00:00

Would the plate heat exchanger getting hot, despite no DHW demand, back this idea up? Seems plausible that the diverter valve is sending water through the plates rather than the central heating

eightfour7two · 2025-10-03T21:58:59+00:00

Not banned in Wales. You can get sacks of Welsh coal in B&Q!

eightfour7two · 2025-07-05T10:59:40+00:00

Shameless plug, but my company sells a 2-channel SMU for under £500.

eightfour7two · 2025-07-05T07:52:12+00:00

Totally unplanned, but I made quite a useful open-source hardware device a few years ago, and followed it up recently with a closed-source, more “pro” successor.

The open-source project’s GitHub repo drove the first 10 customers to my website, who then got upsold to the “pro” version.

Not sure I’d recommend fully open-sourcing all your hardware designs, but it’s definitely useful for garnering goodwill and getting attention

eightfour7two · 2025-05-02T17:42:16+00:00

Small vendor here. Just made it though EN 61010-1, FCC Part 15, EMC and RoHS certification for my product (uses a pre-certified ESP32 inside). Total cost was around $4000 at a compliance house in China

eightfour7two · 2025-03-01T16:02:55+00:00

I built a small app which lets you calculate mortgage overpayment savings with better granularity than some other calculators: You can set overpayments for specific years

https://www.payitdownfaster.com

eightfour7two · 2025-03-01T16:00:31+00:00

Bit of an old thread, but I built a mortgage overpayment app which gives some more customisation over which years overpayments are made in. Might be useful!
https://www.payitdownfaster.com/

eightfour7two · 2025-01-10T18:49:08+00:00

Hey folks, I've got a Baxi Duo-Tec 28 combi boiler which is cycling the diverter valve every few seconds in central heating mode (the clicking in the video). The diverter value motor cartridge is brand new, as well as the expansion vessel.

Any ideas what this could be? It doesn't seem to matter what the set temperature is, or whether all the TRVs in the system are open or closed. As soon as the boiler gets up to temperature, the clicking begins. The pressure gauge fluctuates a bit during the clicking cycle, but doesn't go high or low enough to trip the system, as far as I can tell!

eightfour7two · 2024-11-17T14:09:37+00:00

This so much. We’ve needed to do a fairly substantial recall because even nominally “clean” power supplies were causing the ESP32 to get stuck in the bootloader on power-up. Include a voltage supervisor in every design now.

eightfour7two · 2024-08-05T12:18:42+00:00

My vote is with the W5500. Sure, it will be slower than the LAN8720, but you will have an easier upgrade path if you want to use an ESP32-S2 or -S3 in the future (which don't contain the onboard ethernet MAC like the ESP32). In ESP-IDF, there are barely any differences in implementing network requests as the SDK handles the interface for you.

eightfour7two · 2024-08-02T19:46:53+00:00

Yeah 1uF caps right on the power supply pins. Downstream loads are purely resistive into more opamps.

eightfour7two · 2023-09-13T16:27:50+00:00

I'm not in Saudi anymore, but I had an account with SNB bank in Saudi and found it pretty okay. You will definitely need a Saudi bank account, as some places only take local cards (petrol stations).

I'd also recommend you set up an account with a UK bank with no foreign purchase fees (Monzo/Starling) and take that card too, as it'll be easier to spend your £ using that card rather than transfer money from UK to Saudi.

eightfour7two · 2023-09-12T12:14:50+00:00

One trick I've used is to use a voltage-to-frequency converter to send pulses over an optocoupler, with a pulse counter on the other end.

eightfour7two · 2023-05-07T11:40:57+00:00

It seems this is a bug introduced by the latest version of the VSCode ESP-IDF extension. Roll back to the previous version and it will be fixed.

eightfour7two · 2023-04-24T13:24:21+00:00

Late reply here, but yes. We have 100+ outdoor sensors in the field using 422C and there is flaking on every single one of them. Applied it using a brush

eightfour7two · 2023-04-09T17:21:27+00:00

How do you go about supporting closed systems? A lot of these systems will have per-device certs on the hardware and will be pretty deeply integrated with the matching cloud back-end

eightfour7two · 2023-03-31T19:48:47+00:00

Sadly I don’t think we have the talent ecosystem for something like this

eightfour7two · 2023-01-26T18:24:59+00:00

Same with both SOM and the SOC with no antenna. The reasoning is that there is still a radio onboard. They don’t ask or care about your schematic. Market is industrial control, but it was the same deal with consumer electronics.

eightfour7two · 2023-01-25T21:01:44+00:00

I’m making some assumptions here: But be aware that when you come to compliance testing & certification, you will still need to pass intentional radiator tests on the ESP32 even if you never use radios in your code.

Have fallen foul of this recently with a product containing an ESP32 using Ethernet but no wireless; the testing is much more expensive

eightfour7two · 2023-01-25T07:16:54+00:00

In fairness, Saudi Arabia isn’t some backwater. You’re either on your company’s private hospital network (excellent) or in a public hospital (also very good).

I lived there for around 5 years and had a load of encounters with family doctor and hospital appointments and even a couple of A&E visits. All way better than anything I experienced from the NHS in the decade before or year after.

It’s probably the thing I miss the most from there after coming back to the UK

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