Hotspot water heater

I know this group is for Rheem but wanted to check if someone can answer for Rinnai. I have been getting error code 10 on Rinnai Tankless Water heater. Checked the exhaust lines and no blockage. Cleaned the combustion fan too. My suspect is that the motor and fan needs replacement. Attaching video so you can hear the sound and suggest or let me know what additional information would be required to diagnose?

Citroen Relay (2018) for sale near Worcester, UK. Looking for sale as soon as possible so please get in contact with me if you are interested.
Quirky self-converted campervan used for travelling Europe – going as far south as Croatia, for 3 months. It is equipped for full time travel or weekend trips.
Please see below for full vehicle description.
Electrics: 3 x 140w Victron solar panels 3 x 125Ah batteries 40a DC – DC charger 2000w Renogy pure sine inverter Bluetooth battery monitoring system
Living space: Lavaner Pro Diesel Heater with remote scheduling (vents in both main living space and bathroom) Dometic CRX65 fridge CamperGlass sliding privacy window CamperGlass privacy glass rear windows Full double size bed Dimmable lighting Reading lights with USB UK plug sockets MaxxAir fan Bulkhead storage space
Plumbing: Full height shower BobilVans hot water kit 50L under slung grey waste tank 80L fresh water tank Shurflo Trail King 7, 20PSI pump
Cab: Reversing Camera Nextbase 322GW dashcam European travel kit
Specs: Full service history MOT valid until 12/09/2024 6 speed manual gearbox Cruise control Daytime running lights Bluetooth DAB radio 2L Blue HDI 130 engine
Travel: Emission vignettes valid for France, Germany, Austria ULEZ compliant
Beds Description Fixed double bed 190x135cm
Main Bed Length 190cm

I bought them about a week ago. The person I bought then from told me to float them for a week so their roots can grow more. Today is a week later and I just buried the roots in gravel. You can still see a little bit of roots, I don’t know if that’s what’s supposed to happen. I’m not sure if they look healthy or not. Picture two does seem to have a bit of rotting of darkness or something on it. Is ten hours of light too much? I don’t mind the algae, as my snail does love to eat it. The person at my local pet store said that I probably didn’t need fertilizer. But should I get a fertilizer anyways and if so what kind can I buy off amazon or a small pet store? Located NW Canada.
For anyone wondering I am doing a water change after I post this.
Preset heater 78*F Sponge filter 5gallon tank. 3inches of rocks Fully cycled for about 3/4 year Nicrew ClassicLED plus V2 light

I got rid of gas furnace and the chimney is currently used only for my atmospheric vented gas water heater, which I plan to replace. I can direct vent with coaxial flue through the side wall but that would go close to the area we sit in the backyard, and so I am concerned about possible discomfort over there. I am also concerned about possible noise from a power vented heater.
Is it possible and safe to put coaxial inside existing chimney for a direct vent water heater? Water heater is in basement and there is one floor above it.

January 2021, after the retail holiday had ended, it was time for a well-earned vacation. When looking at rentals on Airbnb, I was searching for two things: WiFi and a hot tub in the mountains. I found a lovely one-bedroom, one-bathroom rental off the highway in Idaho Springs.
The travel time was four hours, and we arrived very early for check-in. We were so early that we got to meet the owner and her tiny dog. My guest reviews on the app show that I’m very communicative, and although I have a knack for unexpected delays, this trip was the sole exception.
She was preparing the house for our visit and formally showed us the space. She also provided a home-printed binder booklet of travel/house details and another guestbook for visitors to sign.
She left promptly at our actual check-in time, and the place was ours. It was HOT TUB IN THE SNOW TIME.
The rental had everything you could possibly need to cook. Many appliances were largely unused due to their incredibly specific functions, but they were a nice addition, especially since many rentals skip on cutlery and basic kitchenware.
The roof was especially sloped, making the space seem hexagonal from the outside. A sunroom separates the entrance from the outside, creating an enclosed porch with sliding doors on the left and right walls. The cabin itself was very beautiful. All wood, though I can't speak to the type—just very real and strong authentic carpentry. A functional large brick fireplace is the focal point upon entry into the living space.
There was only one other entrance, which we never used, as it was on the far left side of the house, behind the kitchen, where the path was hidden beneath snow. Nearest the exit is a locked door, which could lead to a basement or a water heater—we never found out. The adjacent door leads to a classically tiled bathroom with a enclosed tub. A huge mirror sits on a slant against the wall of the master bedroom, opposite the door and parallel to a tall window. The internet has taught me to always look behind mirrors and inspect other objects for small filming equipment, but there were none.
We had intended on staying for two nights. That’s all we could afford to take off work with a retail salary. The hot tub was a blessing, and the cabin was near a small town with flea markets and other adventures to explore. However, we never went into the town.
There is a certain irony to a cliché coming true. Of course, the most chilling events didn't unfold at 1 or 2:30, but at 3:05 a.m. It wasn’t a bump or a bear or anything that could make sense—it was a doorbell that sang. Not a simple "ding-dong" that could be slept through, but the entire Westminster chime. I had to Google the song because I never knew the name, only humming it out loud during explanations. It's 15 seconds long, completely unmistakable, and there wasn't a single grandfather clock to blame it on. Ten seconds in, I'm waking up my date to ensure this isn't some exclusive hallucination.
I flood the cabin with lights while they get up and look out of every window and peephole from the inside. No rustling, no figure or animal to be seen, no tracks in the snow. All the doors are already locked, and with no other explanation, it must have been a fluke of some kind.
If it had only been once, maybe it would have been. But at 3:45, an encore of Westminster chimes played.
After some well-deserved rest following two doorbell performances, it was time for a thorough investigation of the premises.
The unused exit door does have a doorbell, but no chime can be heard when pressed. This is the only doorbell on the outside. Inside the sunroom is the only other doorbell, and not only does it start the chime we’ve heard before, but it also has to be pushed in no less than two inches to ring at all.
I was scared after the first and final chime and figured the host might offer a solution—blah blah wiring or something similar. They offered to turn off the doorbell. That’s when my date finally expressed their fears.
“If they turn it off and it happens again, we will have been the idiots that end up in a movie.”
Their fear only made me spiral, but not enough to prevent me from getting one more jump in the hot tub. The host refunded us for the second night since we were checking out early. Not wanting to be alone but not wanting to take a dip, my date waited by the tub while my iPad was in the cabin filming for any activity. The footage is long, and the results didn’t catch anything that I could scrub for.
Did we leave too early? The cabin and the host were both entirely welcoming but the bell was enough of a warning to pack up. I took pictures with time stamps of the second bell ring and might even still be able to recover the nothing footage. This footage and correspondence with the host are on a damaged phone but once its repaired I will update with more evidence. I have the booking details for anyone who wants to know more about the layout: airbnb listing This is the closest I have ever come to the paranormal, it could be fun to go back and get more footage, after all the listing seems active.

I see so many of these where people romanticise tiny home/off-grid/homestead lifestyles and beg to make it happen, only to realise it's not so easy and refreshing as they anticipated.

Hi! I’m a new Betta lover, im still learning a lot and am on my second Betta. He’s an alien who lives in a 5 gallon with a filter and heater, some plants (i need more), a floating log, and some mushroom hammocks he likes. I recently did a move which required a large water change and inevitably and tragically killed my old Betta (who was already sick). While the water was testing fine before, I am realizing the water is hard. I added almond leaves because I heard those helped. My betta seems happy I just really wanna keep him healthy. Still not testing great. How should i proceed? These have been added about four days ago.

Sorry for the bad pictures he kept moving around. The last pic in the cup was him during a water change a month ago for reference.
I’ve had my betta since Oct and have just been noticing that he has been bloated for just over a week now. In full honestly I got him during a manic episode so I didn’t have the proper supplies or a cycled tank but I have been researching since then and I am working on getting a bigger tank and the proper supplies.
I noticed that he looked bloated about a week ago and I have been fasting ever since but I haven’t seen any changes, I noticed his fine look a bit off and am not sure if it’s biting or fin rot so I have been treating with API betta fix for the past 2 days just in case. I am thinking now it might be some constipation and am waiting for daphnia to come in the mail but I am reaching out in case I need something more urgently. I didn’t think it was dropsy because I haven’t noticed pineconing but it is hard for me to tell so I am at a loss on what to do. Any help on this would be appreciated or let me know if more details are needed.
I noticed that the alkalinity and the hardness of the water is high as well but I’m not sure on how to get those down, so help on if and how to fix that would be appreciated as well. Below are the specifications:
Size: 1 gal 7.5 w heater and a filter 78 f temperature Test strip in pic 4 gotten using Tetra strips I have been doing full water changes every 2 weeks but since learning about cycling the tank I have been doing 25% per week. No tank mates I was doing about 10 pellets per day but now I do 2-3 a day after fasting for a week. I have 2 silicone plants in the tank at the moment and a leaf hammock.