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My Ariston Eurocombi will not light when cold for either heating or water. It goes to red light lock out. BG engineer been round but because fault only happens from cold cannot find problem. If you power off and back on quick it lights.

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Check overheat stat als o fan esp little hose close to fan area check for pinhole, best of luck

Posted on Nov 06, 2009

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Thanks for that mike, it is a worcester bosch combi 24cdi heating and water can stay on for an hour then everything goes off and the red light flashes. it will come straight back on when reset, but then...


Check the pressure reading, should be about 1 bar when system is cold. Various models in the range of 24cdi. If you do not have a manual, go to,
http://www.centralheating.co.uk/Boiler-Manuals/worcester-bosch-boiler-manuals/worcester-bosch-discontinued-boiler-manuals.
Get the manual for your unit, to wards the end of install manual it has a fault finder, Also has a basic 1 in the user manual. Number of flashes how fast the light flashes which one flashing can all mean different, So get the manual and check, Some parts are easy to fix, as long as you do not touch the gas side the rest is plumbing. Come back if needed.

Mar 05, 2013 | Water Heaters

1 Answer

Bosch 2.5 gl water heater does not work. there is power to the unit but not action at switch or themostate. is there a high limit switch that can be tripped and rest and where is it


Ariston 2.5ga reset button is located on thermostat.
Following image shows location of reset button:
http://waterheatertimer.org/images/Bosch-Ariston-reset-400.jpg

Open following link for Bosch troubleshooting resources and link to your manual.
Read manual entirely to empower yourself and to avoid-anticipate problems.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Manual says:
Occasionally, the high temperature limit shut off device may trigger and shut the
system down. This occurs when water temperature exceeds 190° F and shuts off
power to the heating element. The shut off device may also trigger from a power
outage or electrical storm.
To reach the thermostat:
1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with
a small flat-head screwdriver.
2. Remove the Phillips screw revealed beneath the round cover plate.
3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When
reassembling, work in the opposite way being careful to insert the tongue of the
cover into the slot.
4. Firmly press reset button (B Fig. 4). Reconnect power.
5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from
high to low, if the red light does not go off on low setting, turn off power supply and
call a service person to replace the thermostat.
6. If the system works, place dial setting to desired setting. Note: a lower setting is
more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.

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May 19, 2011 | Bosch Ariston GL2.5 GL2.5 Point-of-Use...

1 Answer

The unit is no longer heating the water. The red light comes on indicating that the unit is heating the water, but only cold water comes out of the faucet. We've tried raising and lowering the...


This will be a thermostat or element problem. The red light tells us that you have power to the unit. If you are handy you can test the thermostat and the element with a continuity tester. A voltmeter may also be used. This will tell you where the fault lies.

Mar 06, 2011 | Stiebel Eltron Tempra 24 Electric Hot...

1 Answer

My gl4 ariston the only way it will heat water is to reset it . It will heat water til it get hot and then you have to reset it to get the water hot again


Occasionally, the high temperature limit shut off device may trigger and shut the

system down. This occurs when water temperature exceeds 190° F and shuts off

power to the heating element. The shut off device may also trigger from a power

outage or electrical storm.

To reach the thermostat:

1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with

a small flat-head screwdriver.

2. Remove the Phillips screw revealed beneath the round cover plate.

3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When

reassembling, work in the opposite way being careful to insert the tongue of the

cover into the slot.

4. Firmly press reset button (B Fig. 4). Reconnect power.

5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from

high to low, if the red light does not go off on low setting, turn off power supply and

call a service person to replace the thermostat.

6. If the system works, place dial setting to desired setting. Note: a lower setting is

more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.

Sep 24, 2010 | Bosch Ariston GL4 GL4 Point-of-Use...

2 Answers

Hi there, I have a rinnai 20 ,the water heats up


Usually this type of fault is down to poor water flow. Basically you are asking the unit to work at a level below it's minimum output. Easy thing to try is to check any filters or water flow limiters in your tapware. Usually these are in the nozzle of the tap. I often take these out. The inifinty reduces water flow anyway and there is no reason to have water limiters. Try turning on two taps at once. If this stops the fault then you definately need to increase your water flow. Make sure the mains water is turned on full. Aslo you can check the cold water filter on the infinity. It's just above the cold water isolation tap (middle pipe as you look at it), turn that off first, the filter is a round plastic nut, unscreww it and clean the filter. Reconnect, turn you mains water back on.
There are other faults but this is by far the most common.

Aug 14, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

I am not getting any hot water, only cold water, when I run my hot water taps. I have an Ariston Bravo water heater. Normally I have permanent hot water at any time. My central heating seems to be...


Sounds like the by-pass valve diaphragm. This valve detects that hot water is being drawn off at the tap and then diverts the mains input water across the heat exchanger. Very often it's the diaphragm inside the valve which is punctured or split.This can be replaced [depending on model] if you take apart the valve
. Remove the front panel and lower the control panel.The valve is at the bottom left of the boiler
Suggest turning off the service taps to the two heating pipes and the cold mains inlet pipes before tackling the valve

Mar 20, 2010 | Water Heaters

1 Answer

Blinking red light no heat


It sounds like you are actually in lock out. Recycle is when during a call for heat, the flame goes out, the unit will try to restart itself. Hope this helps

Nov 10, 2009 | Water Heaters

1 Answer

Size and installation for instant water heater


Ariston gl4.0 should be fine if used inline with your hot water heater. Used alone it will likely run out when dishwasher is filling and you are using sink.To use your existing hot water for backup: 1 connect existing HOT water line to cold (inlet) on ariston, 2 Then HOT (outlet) from ariston to sink and dw. If you want instant hot water at a sink 10 feet away: use 3/8 pex pipe from ariston to sink, so you only have to run off a cupful or 2 before hot water arrives at sink.

Aug 30, 2009 | RTO Ariston Gl4.0 Instantaneous Electronic...

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