20 Most Recent Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater... - Page 7 Questions & Answers

Can you get the manual online? You have the Manufacturer info so you probably have the model number too. I found a manual on Manuals.com for my boiler so they may have yours too which will hopefully have some information on filling boiler although I realize each installation is somewhat different but that's why it's difficult to answer you question. Usually there is a manual pressure valve that regulates the water pressure in the boiler which is usually pretty low...like less than 20 lbs. The manual should tell you the pressure as well. But this pressure valve has a flip handle that comes off the cold water line to the boiler to do just what you want to do...refill it with water. When refilling the boiler (if you find the valve, you may have to purge the air out of the lines which there is a whole other process for. But you shouldn't allow cold water into a hot boiler...it could crack it when the cold water hits the hot cast iron. So make sure the boiler is cool when filling it up. Now go try to find that manual!

Having problem finding one. Is there a model #? Also what are you trying to find out? as sometime googling the problem finds a solution faster than googling manual.

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Your electronic ignition unit is not rectifying through the gas flame, it is a sensitive piece of equipment and has failed.

I believe they are under the unit by the pump.

refill the gas bottles and then if that doesn't fix it, get a technician out as it may be the pressure switch not opening the gas so that the pilot light ignites the burner

As cold water enters the heater. its heated by the pilot flame, and takes a while before u have total hot water? what do u mean by cuts off? perhaps u have a pilot heating problem due to it going or coming off and on? are there any air drafts around the heater?

They recommend you have a service guy do it but if you use care manuals are here Discontinued product literature or here https://www.worcester-bosch.co.uk/installer/literature/oil-fired-boiler-literature

Pilot will not light? at all? or does it light as long as you are holding it in then goes out when you let it go? If you know it has gas to it, I would say bad thermal couple

In that case get it repaired under warranty. Do not attempt to repair it yourself for two reasons:

1. it could invalidate your warranty
2. unless you are GasSafe (or equivalent) registered, it's against the law to repair gas appliances, even your own, for obvious reasons, both explosion and carbon monoxide.