Question about Bosch Thd2021gb Filtrino Fast Cup Hot Filtered Water Dispenser

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Descaler stopped working

The descaler has stopped working which means the water heater has stopped working as well

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Is white vinegar a god descaler for the heat exchanger?


white vinegar is good for that, but make sure you have all the equipment that you need to do this. Go to http://waterheatertimer.org/troubleshoot-bosch-tankless-water-heater.html. that will give you all the info un need

Mar 16, 2015 | Water Heaters

1 Answer

I have a Ecosense.... My tankless hot water is not working it turn off when i use it for 2 to 3 min


Most likely the heat exchanger has build up in it, the unit will need to be flushed with descaler. But refer to the owners manual or behind the cover of the unit to confirm the error code. Good luck.

Nov 05, 2013 | Water Heaters

3 Answers

Descaling instructions bosh filtrino fast cup


It took me ages to get his to work - seems that on the THD2023GB (Black) Filtrino, you push and hold the temp. set button for 10 seconds to get he descale programme running.

Sep 30, 2012 | Bosch Thd2021gb Filtrino Fast Cup Hot...

1 Answer

The Noritz HW Heater has been tripping out some (usually whenever the shower is running, and someone turns on cold water). LED flashing three times. Any Ideas


This is probably a 16 error code. This code indicates the outlet water spiked above the set temperature for an extended period. It usually means the heater needs to be descaled or the manifold pressures need to be adjusted.

Mar 10, 2011 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

I have a Nortitz natural gas water heater, model #N-063s-1. Acouple of days ago it stopped heating the water. what can I do myself to fix this matter. Thanks, lynnatheana@hotmail.com


There are many reasons a tankless heater will stop heating water. The first thing I would look for is a flashing red light on the burner indicator. The flash break down goes as follows

continuous blinking - typically means ignition failure or the unit is overheating; look for visible water inside the unit, have your gas pressure checked, or check the flame rod/igniter for buildup of debris

three blinks - typically indicates 16 error code; typically resolved by performing a descale

4 or 5 blinks - exotic error codes; for these you should definitely contact Noritz tech support

If there is no flashing light, first check your filter for debris. If the filter is clean, your flow sensor is probably stuck. Again I'd recommend contacting Noritz tech support to help you clean the flow sensor.

Jul 31, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Getting error code 16. what does it mean and what


a 16 error code is typically caused by scale formation. I'd recommend performing a descale on the heater.

Mar 06, 2010 | Noritz 6.9 Gallon Residential Direct Vent...

1 Answer

I have a noritz water tankless heater and hot water stopped. Red light blinking three times. Need help.


Three flashes typically indicates the unit is overheating due to scale. I'd try a descale initially and see if that remedies the problem.

Dec 27, 2009 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Error code 14 shows on the remote for a noritz tankless lpg water heater. what does it mean?


This means the thermal fuse has broken and needs replacement. The thermal fuse is a white cord which wraps around the heat exchanger. It typically breaks if the unit is excessively dirty and sooted. Before the fuse is replaced you should make sure the unit is cleaned with compressed air and descaled.

Dec 10, 2009 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Tankless water heater: cold sandwich effect. While showering, hot water stops for about 1 min and then runs again. Was fine for 5 years.


tankless water heaters are a great appliance with one small draw back they require a constant flow of water through them to maintain production of hot water if the water presure fluctuates they can cut out momentarily or if your water supply is less than great ie hard ,high iron,
sulpher ect.. then the heat exchanger can become plugged over time like say 5 years. Contamination of the flow sensor/presure switch could also be a culprit depending on how handy you are a through cleaning with a good kettle descaler will probably help.
Good Luck

Oct 07, 2009 | Water Heaters

2 Answers

Sediment in lines -Bosch Tankless Water heater


I would recommend a simple sediment filter housing be installed on the main water line coming into the house. Material cost about $100. Have a plumber install a bypass loop so you can just shut off 2 valves when you need to change it. I always install one with any tankless heater as cheap insurance against such a problem. As far as adding something to clean the lines I would refer to the manufacturer's instructions and use only what they recommend in order to preserve your warranty. For a solar water heater I prefer Velux.

Please rate if this helps-

Mar 28, 2009 | Bosch & Tankless LP Hot Water Heater

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