New battery,gas on,water on,thermo couple must be bad but where do you buy one?
The S 13 BP is a simple unit that does not have a pilot light. It uses electronic ignition on demand, which is what you hear clicking. If there is no gas going through and you've verified there is gas to the inlet, then it has to be the gas control valve.
SOURCE: no hot water, pilot light lights but no burner ignition
Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.
SOURCE: On-demand Bosch Confort 13 water only works intermittently
will still be under warrent call supplier
SOURCE: heater will not ignite
The sensor that allows the pilot to ignite is at fault
replace the probe that points at the pilot light which is the sensor
SOURCE: I have a Bosch confort
Your contractor understand the market there, but problems are mirrored in US also.
As evidenced by fixya.
1) Tankless cannot be exposed to more than 11 grains hard water, and require minimum water flow and water pressure or sensors will shut down burner or element.
2) For example, tankless might turn on with 2/3 gallon-per-minute water flow, but then another faucet is turned on so pressure and water flow drop, and tankless turns off. Or neighbor's water usage causes decrease in line flow, so tankless turns off. This is called 'cold water sandwich.'
3) If problem is water pressure, you can add in-line pressure tank, but root causes vary widely with more than one factor as suspect.
4) Also incoming water temperature can be a factor, along with temperature setting of unit. Most tankless are preset to 120 degrees F, which is modest temperature and certainly not very high. If tankless cannot raise temperature of incoming water fast enough, then tankless turns off. Of course water flow continues, so you get dose of cold water.
You can add simple120Volt 30 gallon tank-type electric heater as a tempering tank that pre-heats water either passively or actively: http://waterheatertimer.org/Tempering-tank.html
5) Both internal and external factors affect tankless, with bottom line that these high-tech devices are not do-it-yourself repair for most people.
6) Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html
7) In my opinion, the genius of tankless is not that they save money or energy. Because they don't.
The genius is marketing that targets a certain affluent who believe tankless save money and energy.
http://waterheatertimer.org/pro-n-con.html
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Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.
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