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I have a 11 year old Saunier Duval and the hot water hardly works

Its a difficult probelm to explain and makes no difference if the heating is on or not and is much worse on Cold days. When I turn the hot water on the boiler fires up but after 10-30 secs goes of then gos on and off like someone is switching the gas on and off. The higher I try and have the temp of the water the worse it gets. Now cannot even have a shower on a cold day!!

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  • Combi Master
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Suggest you call a repair service. gas appliances are dangerous to DIY they explode when people do not use the proper safety precautions

Posted on Aug 31, 2017

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6ya6ya
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Posted on Jan 02, 2017

  • 7 Answers

SOURCE: Combi bolier problem

either the h/w flow switch or diaphram reqs replacement or the secondary heat ex or (calorifier) is blocked and prevents the heat from leaving the biler to hget to he taps- the heat starts ok but backs up to the boiler very quickly causing it to shut down

Posted on Sep 18, 2008

  • 1 Answer

SOURCE: no hot water from combi boiler

i have a combie bolier when i turn the hot water taps on only cold water comes out central heating working fine can any one give some advise ?and can i fix it myself.

Posted on Mar 20, 2009

  • 16 Answers

SOURCE: boiler flames extinguish and reignite regularly

what about flame rectification probe (flame proving probe)

Posted on Aug 17, 2009

darm1970
  • 6 Answers

SOURCE: My boiler when switched on gives hot water at

you never mentioned what boiler it is. could be the diverter valve, PCB or overheat stat. all depends on model and type

Posted on Nov 09, 2011

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SAUNIER DUVAL model 31-026. Where can I obtain a troubleshooting manual?


Boiler Manuals: Saunier Duval - Plumbase

https://www.plumbase.co.uk/documents/index/10000204
Boiler Manuals for the Saunier Duval range. ... Saunier Duval Thema Range · Saunier Combitek F23E · Saunier Duval Isomax F28E · Saunier Duval Sylva ..

Aug 20, 2015 | Heating & Cooling

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Saunier Duval ISOFAST F35E on hot water only makes a noise like a motor bike that vibrates through the pipework, this does not happen when the central heating is on, any ideas as to the cause.


The water pipes (steel) are probably full of rust. The noise is air in the pipes.
Use the pressure relief valve to let air escape.
The risk is if the relief valve is old it may not shut off.
Also air will build up again

Nov 05, 2014 | Water Heaters

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Can I get a manual for a saunier duval instaneous gas water heater?


Yes. Just go through the company you purchased it from for this manual.

Sep 09, 2014 | Water Heaters

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Boiler pressure saunier duval


Appear to be corroded/plugged inlet valve. De-pressurize system and check inlet valves and line.

May 11, 2013 | Water Heaters

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Low pressure Saunier Duval therma condens boiler


May need to replace valves (appear to be corroded and plugged with deposits) and install a water conditioner in the inlet line if you have hard water.

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Have Model EX380T2T2 Serial # 777604. Have purchased two EX630 heating elements and installed them. Water got hot for about a week. One more old heating element burned out. Fixed it by reattaching to...


A lot of problems can contribute to this problem.
As you know, tankless cannot be exposed to water with more than 11 grains of hardness.
Tankless require softener and filter system which can affect line pressure and flow, which will adversely affect tankless unit.

The problem could be clogged sensor, bad board, but still that doesn't explain burned out elements unless the elements were coated with sediment.
Sediment build up will kill a tankless within 2 years and render it useless and unfixable.
Yearly deliming will not restore functionality.
If pressure is a contributing factor, you can add a pressure tank that will even out the pressure.
All in all it looks like the pressure sensors and other sensors are crashing.
Call service technician, and glean from that person the tips and tricks.

Read the manual for advisories and required yearly maintenance.

You can fix this tankless problem yourself, same day, by installing $207 tank-type electric water heater from box store. Offer 10% less and also buy flexible connectors to connect to existing water lines. The cost of running and maintaining electric tank-type is cheaper long term. All costs are energy.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

May 01, 2011 | Eemax EX380T2T2 Series 4 Whole House...

1 Answer

Hi, I have a Saunier Duval? Theilea twin 28e


You may want to check the Pressure Reducing Valve On the supply line to the building. Easiest way to check is get a guage that hooks up to your hose bib (usually found in the sprinkler section at your hardware store). If your pressure is getting above 80, you need a new PRV.

Feb 14, 2011 | Water Heaters

1 Answer

Low pressure for SAUNIER DUVAL TERMACLASSIC


there is a blue tap at the bottom of the boiler when you turn it and nothing happends the screw had broken off inside you can do 2 things here put a new filling tap on the boiler , or get a filling loop put some where else on the system and if you still get low pressure replace the low water pressure switch...

Jan 31, 2011 | Heating & Cooling

1 Answer

Hi, Got a Saunier Duval Thema F 23 E and need to repressurise it (currently at 0 bars). can you provide any help on how to do it? Thanks.


http://www.saunier-duval.co.uk/manuals/pdf/noncurrent_products/installation_ThemaF23e-SBF23e.pdf

Here are complete instructions for installation and service including purging air and refilling. One of the first suggestions is that service is to be referred to a competent technician.

Gary

Dec 18, 2010 | Water Heaters

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