Bosch Electronic Highflow Questions & Answers (page 3 of 11)

14 year old Bosh Highflow 21e gas hot water system serviced every two years. Highest temp set at 55, but can be adjusted by mains controller. When turned on for the first time in the morning the red light comes on and the water starts to warm up, but after a few seconds the red light starts to flash followed by the number 16. This is followed by the unit and the water flow cutting out . We do this a couple of times and the unit works ok, but the temp fluctuates. When we take our showers later in the morning at a reduced temp of 43 there is rarely a problem, but the temp still fluctuates. Can this be fixed, or do we need to buy a new unit?

Hey All,

My Bosch Highflow 21e keeps making a noise like goose, the unit is connected to gas mains and is over 7 years old, we inherited it when moving into the house.

Any help would be great

We've had a Bosch high flow 21e gas water heater for10 years with no problems at all but now the hot water temperature is much lower so much so that now we don't use any cold at all just hot. There's no visible means of adjustment. Can the water temperature be adjusted. Both the gas and the water control valves are wide open and have never been altered from installation.
Cam M

Hi,I got a new bosch highflow 26 with bluetooth (3rd one in 2.5 years via warranty) about a month ago, connected to the bluetooth after installation,was mucking around with the app and set the temp to 50C, went back a couple of days later to put it back to 55 and now my phone won't connect, have tried deleting and reloading app, using different devices, but the highflow doesn't even show up to connect to, I have also tried turning off and on but temp is still stuck at 50C any ideas on how to reset? I'm not bothered about the bluetooth as it's useless anyway, just want my water hotter

is there a pilot light

does this unit have a pilot light

How to start controller

We have the Highflow 17e Natural Gas hot water system.
Over the past year or so it has been shutting off - ie in the middle of a shower. We have had service people around and they cannot figure out the issue. I have also spoken to one or two who specialise in these systems - also no idea. Basically they tell us that it would be cheaper and easier (for them more likely!) to just replace the whole system.
It works fine for most of the time - and problem free for months on end. Then suddenly - as is the case now (May 2020) - it shuts off just about every shower; and often several times.
What we are doing is switching the mains power off for a few seconds; then on again and it seems to 'reboot' the control system - or whatever!
We do not have the control unit for this system.
It is a constant annoyance. Does anyone know about this issue - what is actually wrong. Is there a fix??
Typically at this time - when we are homebound, jobless, no money, winter approaching - these things happen.
Its probably 7-8 years old.

We have the Highflow 17e Natural Gas hot water system.
Over the past year or so it has been shutting off - ie in the middle of a shower. We have had service people around and they cannot figure out the issue. I have also spoken to one or two who specialise in these systems - also no idea. Basically they tell us that it would be cheaper and easier (for them more likely!) to just replace the whole system.
It works fine for most of the time - and problem free for months on end. Then suddenly - as is the case now (May 2020) - it shuts off just about every shower; and often several times.
What we are doing is switching the mains power off for a few seconds; then on again and it seems to 'reboot' the control system - or whatever!
We do not have the control unit for this system.
It is a constant annoyance. Does anyone know about this issue - what is actually wrong. Is there a fix??
Typically at this time - when we are homebound, jobless, no money, winter approaching - these things happen.
Its probably 7-8 years old.

When my gas bottle runs out and i switch to the second bottle the gas won't light up. i remove the front cover and the earth leakage box has a red light on, if i reset it it then works, is that normal, has happened to the last 2 bottles

water passing through but not heating up

Hi I have a 25e. I had a power outage last night couple with a gas bottle change over and I didn’t realise the gas bottle wasn’t open. I have reset the breaker switch in bottom left hand corner and orange light is on but still no pilot light. And open gas bottle Any suggestions please

I have Bosch 22e instantaneous gas tank-less hot water system. Electrician repaired a corroded wire however since then the display does not pass the 40C, it used to be 50C. I need to rectify the situation please.
The controller in the bathroom must be working because when on bath mode the temperature can be adjusted to 48C, can you help, thanks.

I have an instantaneous Bosch Hot water system (Tank less) Model 22e.
stopped working, electrician white wire was burnt and was disconnected from the flat whit plug.
The Electrician by passed the plug and joined the wire. the heater works however the control display unit inside the bathroom shows only 40 *C and does not go up further. it doesn't seem to be broken or malfunctioning, hence when I move the select button to Bath mode the up button moves from 40 to 48 *C without a problem, I need to know how to set the unit, your support is much appreciated. Thank you
Joseph Baraya 0416 0416 40

Hi, My Bosh hi flow 21 is making a very loud noise when I turn on the hot water.
I have cleaned the filter and run the water through, but still continues to make very loud noise.

I have a Bosch 25E highflow and the temperature doesn’t work in one of the bathrooms, what do I do?

How do I turn on my Bosch 26 Water heater? Ive just purchased a house and the previous owners have not left instructions for turning it on

Can the cabinet be painted to suit house colour

I am in a rental and the Bosch Highflow 16 has stopped working. There is gas and electricity to the unit. What can I do please?
Paul

What size generator needed to run heater