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Hi I have a problem with my valiant combo boiler making aeroplane noises when heating comes on and i turn on the hot water. It's only started doing this so can some body help.

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You don't say what model your boiler is but if its one of the older types in my experience its caused by the built in bye-pass and would require changing it to overcome the noise you describe which is what most customers describe. You can prove it by turning the central heating valve of on the flow side of the boiler momentarily you will hear the noise stop then quickly turn it back on, it often helps to you replace with new one.

Posted on May 09, 2015

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Posted on Jan 02, 2017

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kma836
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SOURCE: boiler overheating

the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

Posted on Oct 18, 2008

gary1121
  • 332 Answers

SOURCE: Central heating and hot water have suddenly stopped working

not an engineer but maybe a heating compant,, it sounds like you have a relay that has gone bad, you have what we call a winter summer system your domestic water comes from a tank inside the boiler, you might want to think about splitting the system to save you some money in the long run, seperate the water heater from the boiler so you only heat up in the winter, right now you are heating the system that heats your house to get 30 or 40 gals of domestic hot water, it would cost you less by seperating them

Posted on May 30, 2009

gary1121
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SOURCE: Baxi 80 overheating on hot water circuit

thermostat on the gas valve needs to be replaced,, which you will probly have to change the hole gas vale ,, check on the parts and labor and if it is over 6 years old wheigh the diffrence between it and a new unit good luck

Posted on Jun 10, 2009

  • 150 Answers

SOURCE: Hi there. Our valiant boiler doesn't seem

Lack of pressure in the primary circuit [radiators] Look for a pressure gauge should read between 0.5 & 1.5 bar
Somewhere there is a tap/valve/pipe connection to refill & looks like a small thumb turn or a screwdriver turn on a connection on the mains water inlet pipe. turn on until you get the right pressure then off

Posted on Dec 22, 2009

Testimonial: " Many thanks for your speedy reply. Helpful, although problem not yet solved."

  • 10 Answers

SOURCE: Noisy Hot Water Gushing In Boiler

You may excess air in the lines

Posted on Nov 06, 2012

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Hi there. Our valiant boiler doesn't seem


Lack of pressure in the primary circuit [radiators] Look for a pressure gauge should read between 0.5 & 1.5 bar
Somewhere there is a tap/valve/pipe connection to refill & looks like a small thumb turn or a screwdriver turn on a connection on the mains water inlet pipe. turn on until you get the right pressure then off

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Central heating and hot water have suddenly stopped working


not an engineer but maybe a heating compant,, it sounds like you have a relay that has gone bad, you have what we call a winter summer system your domestic water comes from a tank inside the boiler, you might want to think about splitting the system to save you some money in the long run, seperate the water heater from the boiler so you only heat up in the winter, right now you are heating the system that heats your house to get 30 or 40 gals of domestic hot water, it would cost you less by seperating them

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Boiler overheating


the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

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