Bosch ProTankless GWH C 800 ES LP Tankless Water Heater, Propane - Answered Questions & Fixed issues

Glad it worked out so easily.Be sure to perform the regular maintenance as shown in manual to prevent common error codes. If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

if this is what the problem thing says it is then this type of water heater requires a special instaliation ,the room its in must be ventilated with permant vents through to a outside wall ,then a special valve in the flue pipe to prevent blowback down the chimmney also another valve in the flue to shut off heater in case of a partial blockage liuke a birds nest .If you are not sure of exactly what to do and the security and safety measures that go with this type of heater then get a plumber in unless your mounting it outside in a roofed over space with no sides like a porch .

Sounds like you're dealing with a pesky issue. It could be a technical glitch or just a setting hiccup. Have you tried resetting the timer or checking the settings? If that doesn't do the trick, it might be worth getting a professional to take a look.U can also check some info about alphamechanicals. They got my air conditioning installation in Orangevale, CA https://alphamechanicals.com/service-area/orangevale-hvac-service/ and as I know they has to know something about bosch devices

Losing pendant displays on cool to cold mornings with your Bosch Highflow 25 EC hot water heater could be caused by temperature-related issues affecting the display module. Cold temperatures can affect electronic components, causing them to malfunction. It's possible that there could be a loose connection, moisture buildup, or a fault in the display module itself. I'd recommend contacting Bosch customer support or a qualified technician to diagnose and fix the issue.

If your Bosch Highflow 21e hot water system is experiencing fluctuations in water temperature while showering, it could be caused by a few different factors. Here are some possible reasons for this issue:

1. Flow rate too high: The hot water system may not be able to keep up with the demand if the showerhead or tap is allowing too much water to flow through. This can cause the water temperature to drop suddenly. Try reducing the flow rate by turning down the tap or using a low-flow showerhead.
2. Water pressure fluctuations: If the water pressure in your home fluctuates, it can cause the hot water temperature to vary. This can be caused by various factors, such as other appliances using water at the same time, or changes in municipal water supply pressure. Installing a pressure regulator or a flow restrictor may help to stabilize water pressure.
3. Blocked or dirty water filter: A clogged or dirty water filter in the hot water system can restrict water flow, causing the water temperature to fluctuate. Check the filter and clean or replace it if necessary.
4. Malfunctioning thermostatic mixing valve: The thermostatic mixing valve (TMV) regulates the water temperature in the hot water system. If it's faulty or dirty, it can cause temperature fluctuations. A licensed plumber or technician can inspect the valve and replace it if necessary.
5. Faulty temperature sensor or control board: If the temperature sensor or control board in the hot water system is faulty, it may not be able to maintain a consistent water temperature. A technician can diagnose the issue and repair or replace the faulty component.

If you're unsure about how to diagnose or fix the issue with your hot water system, it's best to contact a licensed plumber or technician for assistance.

The Bosch JSRZ 5-T PG tankless gas water heater may not start automatically because of problems with the magnetic sensor valve, power supply, or control unit/thermostat. Possible troubleshooting steps are:

• inspect the water inlet valve and replace if faulty
• confirm that power to the unit is functioning
• if the problem continues, seek professional repair service.

Do you live in a climate where the hot water line could have frozen? If your heater did freeze up, that could be very bad. This is because water actually expands when it freezes and can do a lot of damage to pipes and to the water heater itself. My other thought is possibly a clogged in line water filter. But typically a clogged water filter would make it run with reduced pressure rather than a complete shutdown all water flow.

https://www.fixya.com/support/t13643459-a2_af_error_codes

need control tested to find what failed

your not making sense with you question --state it goes cold in middle of shower --but state it will stay hot or cold forever ----if its the latter continued hot till you shut off water that normal working if the unit shuts down during shower then you have a problem ----unit is set at one temp and runs at that temp and you use shower 1 handle / 2 valve what ever you own to adjust temp their are really only 4 reasons stops making hot water ----2 are usually well water supply --incoming water pressure /flow or to cold ----other are gas valve -or sensor so i would look into your shower handles since almost all have adjustments and anti scold safety

SEEMS LIKE CALLING A LOCAL PLUMBER IS BEST WAY

most likely. contact a dealer for advice

try Bosch tech support .

check to see if voltage correct if not replace board if ok bad ignitor

WOW!!! Great answer by Steve (I know Steve Spam...real name Richard). Lot of time on his hands (37000 answers). Can we get real professionals answering questions. Thank you Richard...let's just call you Dick for short.

Are you holding the flame button until the thermocouple heats up.

you dont drain theses type water heaters

you can not drain these w/ heaters

first id check shower head most has a screen in them and do get clogged from time to time since the water flows good from faucets

One possibility - insufficient gas flow or oxygen starvation might be making the pilot light dip when the main flame is on so the thermocouple bulb is no longer heated. This will cause the main flame to go out and restore full pressure/sufficient oxygen to the pilot.