Common Halstead Boilers Faults and How to Fix Them

Halstead boilers had their heyday 10-15 years ago. Although their popularity has declined rapidly, they were reliable. And this is why we are still called out to Halstead boiler faults today.

It’s worth mentioning that no boiler problems should be attended to without the help of a boiler repair specialist.

Sick of your Halstead boiler constantly breaking down? Get your fixed price online for a brand new Worcester Bosch via Heatable, one of the most competitively priced installation companies in the UK.

It’s an offence to work on a gas appliance without being Gas Safe registered. And that’s for safety reasons.

Halstead Boilers Faults

Halstead Boiler Fault 1: Water isn’t getting to temperature (or no hot water)

If you’ve already called out an engineer because you’re not getting hot water, or the water is not getting to temperature, it’s likely they’ll head straight for the diverter valve.

The older the boiler is, the more likely the diverter valve is to fail. As Halstead stopped making boilers in 2012, there’s a good chance your boiler is already 5-10 years old.

The diverter valve allows your boiler to switch seamlessly between providing heat and hot water. If you have heat but no hot water, it’s likely it is jammed open on the heating side of the system.

Fixing Hot Water Faults

A boiler repair specialist may inspect the diverter valve and find that it’s just the diaphragm that needs replacing. Even if this is all that needs replacing, it makes sense to replace the whole diverter valve whilst the boiler is in bits.

Depending on the exact model and availability of parts, expect to pay around £250-300 to have this boiler fault fixed.

There’s a good chance if the diverter valve has failed, other parts are likely to follow. If you’d prefer to get prices for a new boiler, you can do that using the clickable form here (takes less than 2 minutes).

Halstead Boiler Fault 2: Ignition Failure but The Boiler Makes a Noise

Ignition problems are common in all brands of boilers, not just Halstead. The type of ignition fault will depend on the cycling process the boiler goes through before it stops working completely.

What should happen is:

  1. The boiler is turned on.
  2. You’ll hear a small click which is the air pressure switch.
  3. The fan should be making a soft humming noise.
  4. The boiler tries to fire but fails.

If this is the case, there’s a good chance the problem lies with the gas valve. By hearing the fan and ignition, that’s pretty much ruled those components out as being part of the fault. The fault lies in the fact the ignition is not getting the right levels of gas.

Fixing Ignition Failures

It’s easy to jump to conclusions. A gas engineer will need to come out and check the gas valve to ensure its operating correctly.

They can do this by using a volt meter and checking the valve is getting voltage. If it’s not, this is a simple fix. Simply replace the gas valve.

But there is a problem. A gas valve for a Halstead boiler can be as much as £250. With labour, you could be looking at nearly £350. If your boiler is particularly old, it doesn’t make sense to spend this amount of money on it.

If your fault is like above but the boiler doesn’t try to ignite (clicking sounds), you might be in luck. It’s likely this relates to the ignition leads and these can be as little as £100 depending on the exact model of Halstead you have.

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Halstead Boiler Fault 3: Ignition Failure but Fan is Working

Even when boilers have a fault, they tend to go through their usual start up cycle and either lockout, or stop at a certain point. If you find your boiler is going through the usual cycle, including the fan being operational, there are two likely causes.

  1. The air pressure switch
  2. The PCB

Fixing Ignition Failures (Air Pressure Switch and PCB)

Hopefully, we’ll find the cause to be the air pressure switch. It’s common that the air pressure switch is the blame if you see the boiler ignite for a split second and then turn off again.

I say hopefully, because an air pressure switch will be around £150 fitted. Although that’s still a large expense, it’s a lot cheaper than it could have been.

In fact, sometimes the hoses leading to the switch have become stuck or kinked. All it needs is for these hoses to be re-routed correctly.

If the air pressure switch doesn’t seem to be the issue, its likely to either be the fan (try to listen for the fan when the boiler starts up) or the PCB.

PCB replacement is usually quite a big job. A Halstead PCB will likely cost £275-325 including labour.

If your boiler is old and unreliable, it makes sense to invest in a new one, rather than investing hundreds in repairs. You can get prices for a new boiler with Heatable’s 90-second quote form.

Halstead Boiler Fault 4: Boiler was Noisy (and now it’s stopped working)

The way a boiler operates just prior to it developing one of these common problems can tell us a lot about what went wrong.If you have noticed your boiler rattling excessively, there’s a good chance the fan is to blame. Over time these fans become worn and stiff and eventually, they are prone to seizing. An engineer will check this by switching off the boiler and then trying to turn the fan by hand.

Fixing a Noisy Boiler

Although the most obvious thing to do would be to replace the fan, there is a potential quick fix. If there is no internal damage to the fan, sometimes lubricant can be used to free the fan (GT85 or WD40 for instance).

Unfortunately, this is only likely to last for a few weeks at best.

Halstead Boilers: Conclusion

A lot of the common Halstead boiler faults we come across are not quick fixes. The majority end up costs £150-300 to repair. For those with older boiler its certainly worth considering getting a get the best prices for a new boiler from Heatable.

The efficiency of newer boilers will save you hundreds of pounds every year.

If you have a Halstead boiler fault that has not been mentioned, please leave a comment below and we’ll do our best to answer your question.

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  1. Hi, our Halstead Boiler ACE HE 30 has started to make droning noise. Each time the taps are opened for a few seconds and closed the boiler will make two to three droning noises- very similar to a subwoofer / base noise.

    Any advice on this would be helpful. Thanks.

  2. Hi, I have a halstead 50 boiler, and ignition lockout light comes on occasionally, resets ok and boiler fires up ok. Problem only occurs when cold (and then not all the time). It looks like it has two igniters (one at the back and one at the front), but only the front sparks, should they both spark ? Any help gratefully accepted.

    1. Hi Roger,

      Potentially a frozen condensate if by “cold” you mean freezing.

      However, your reference to spark generators likely means something else. Is there a fault code being displayed on the control panel?

  3. Hi I have a cbx 32. A few times a day I find that the fault light is on and it stopped working. It shows differential check failure on the light sequence. Replaced 1 temp sensor but it’s still happening. Didn’t believe both sensors would go at same time. Should I replace the other 1. Any advice appreciated

    1. What’s the fault code? Differentials are usually the thermistors, but can be air locks, fault pumps etc.

  4. Hi. I have a Halstead Eden VBX 18 boiler. Had it about 12 years and has never had a problem till now. It starts OK, runs for 5-10 mins then stops. Some time later it starts up, runs again then stops.
    The fault code 5 comes up on the display unit. The manual suggests this could be due to a defective flow, return or flue sensor.
    Action: check these sensors, check wiring to sensors, check PCB/X6 & X8 connectors.
    Any clues?

    1. Hey Ian,
      You’re talking about the NTC thermistors? They monitor flow and return water temperature. They feed back a signal to the PCB which then cuts ignition when it’s up to temp. So, it’s probably a sensing issue. They’re pretty cheap to replace so I’d have an engineer take a look/replace them.

      1. Heating force, many thanks for this. I contacted GlenDimplex and bought all 3 sensors: the 2 water ones and the flue sensor. Replaced the flue sensor: it was very straightforward and everything works perfectly!
        Many thanks for your help.
        Ian.

  5. Hi. We’ve had our gas engineer out 3 times. To cut a long story short all tests kept coming to the conclusion it was the circuit board. We got a new board and it turns out exactly the same problem still. No voltage was being shown going to the gas valve. Would this mean it’s the gas valve? Like I said all checks have been done but everything has pointed to the board! We’ve had a nightmare. It’s an old boiler a Halstead Ace. We know it’s time for a new boiler just wanted to get a bit more time out of it so prepared to get new gas valve. Any help appreciated.

    1. It does sound that way, but I’d not like to suggest that as it already sounds like the tests lead to the wrong diagnosis. I’d get someone out to give a 2nd opinion.

  6. hi I have a halstead best 70. everything works fine, but when the boiler comes to cut out it makes a crackling sound for about 1 minute that you can hear in the pipes.

  7. brilliant tips, I have a weird fault with an Ace30 the hot water is fine but the central heating starts and fires, I can hear the pump running but the gas does not continue. One engineer told me the pump and the air pressure switch the other said its the diverter valve or the pcb

    1. Is there a fault code. The components need to be tested before replacing them, otherwise it could get very expensive, very quickly.

  8. I have a Halstead finest gold boiler the boiler works fine but the only way I can get it to work is by turning it on and of at the mains switch it will not react with the thermostat or the time clock any idea whats wrong

  9. I have a halstead finest gold, making a load rumble and sever vibration when first turned on ch, does even worse when running hot water,. It works OK now and again but becoming more frequent, and results in red lock out light on. Any help appreciated

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