Why Does a Commercial Boiler Keep Locking Out?

A commercial boiler that keeps locking out can quickly become more than an inconvenience. For a business, landlord or facilities manager, repeated boiler problems can mean cold premises, disruption for staff and customers, unhappy tenants and, in some environments, the potential for operations to be affected altogether.

It can also be tempting to simply reset the boiler each time it happens. While a reset may get the heating working again temporarily, repeated lockouts are usually a sign that something within the boiler or wider heating system needs investigating.

At DHC Heating, we provide commercial heating and gas services across Derby and the surrounding areas. Here, we look at some of the reasons a commercial boiler may repeatedly lock out and why the underlying cause shouldn’t be ignored.

What Does Boiler Lockout Mean?

A boiler lockout is a safety feature. Modern commercial boilers continually monitor different aspects of their operation. If the boiler detects a condition that means it cannot operate correctly or safely, it may shut itself down.

Depending on the make and model, the boiler will normally display an error or fault code which can help an appropriately qualified engineer identify what has caused the shutdown.

An occasional lockout does not necessarily mean there is a major problem. However, if you are regularly having to reset a commercial boiler, there is likely to be a reason behind it.

What Can Cause a Commercial Boiler to Keep Locking Out?

There isn’t one single cause of boiler lockout. Commercial heating systems can be considerably larger and more complex than their domestic equivalents, and a fault elsewhere within the system can sometimes affect boiler operation.

Some possible causes include:

Low System Pressure

If the pressure within a sealed heating system drops below the boiler manufacturer’s operating parameters, the boiler may lock out.

A one-off pressure drop may be relatively straightforward to investigate, but pressure that continually falls can indicate another issue, such as a leak or a problem elsewhere within the system.

Continually topping up the system without establishing why pressure is being lost is unlikely to provide a long-term solution.

Ignition or Flame Failure

A commercial boiler needs to establish and maintain the correct flame when there is a demand for heat. Problems during the ignition sequence or failure to detect a stable flame can cause the boiler to shut down.

There are several potential reasons for ignition-related faults, so repeated ignition failure should be properly diagnosed rather than relying on repeated resets.

Circulation Problems

Good water circulation is essential to the operation of a commercial heating system.

Problems with pumps, valves, blockages, air within the system or poor circulation can potentially result in the boiler becoming too hot or operating outside its expected conditions.

In larger commercial premises, circulation issues can also show themselves through inconsistent heating, with certain parts of the building warming correctly while others remain cold.

Overheating

Boilers contain safety controls designed to prevent them operating at unsafe temperatures. If water isn’t circulating effectively, or another component isn’t functioning correctly, excessive temperatures can result in a safety shutdown.

Repeated overheating should never simply be treated by resetting the boiler and carrying on as normal.

Condensate Problems

Condensing commercial boilers produce condensate as part of normal operation. Problems with the condensate pipework or drainage can sometimes prevent the boiler operating correctly.

This can become particularly noticeable during colder weather if external sections of condensate pipework are vulnerable to freezing.

Flue or Air Supply Issues

Commercial boilers require the correct supply of combustion air and a suitable means of safely removing combustion products.

If the boiler detects a problem associated with its flue, fan, air pressure or combustion process, its safety controls may prevent continued operation.

These faults require appropriate investigation by a suitably qualified commercial gas engineer.

Controls and Sensors

Commercial heating installations can include numerous sensors, thermostats, programmers, building controls and safety devices.

A boiler that appears to be at fault may sometimes actually be reacting to incorrect information or a problem elsewhere in the control system. Proper fault finding is therefore important before components are replaced unnecessarily.

Why Constantly Resetting a Commercial Boiler Isn’t the Answer

If pressing the reset button gets the boiler running again, it is understandable why businesses continue doing it.

However, the important question is why did the boiler lock out in the first place?

The lockout is there for a reason. Continually resetting the appliance doesn’t remove the underlying problem and could allow a relatively straightforward fault to develop into a more disruptive breakdown.

Repeated lockouts should therefore be treated as an indication that the boiler and heating system require investigation.

Keeping a note of any error codes displayed before resetting the boiler can also be useful information to provide to your heating engineer.

The Cost of Ignoring an Intermittent Boiler Fault

One of the difficulties with intermittent commercial heating faults is that everything can appear normal again once the boiler has restarted.

This can make it easy to postpone having the problem investigated.

Unfortunately, intermittent faults have a habit of becoming permanent ones – often at the least convenient time.

A boiler that occasionally locks out in September or October may become a much bigger problem once colder weather arrives and the heating system is operating for longer periods and under greater demand.

For businesses that rely heavily on their heating system, dealing with warning signs early can help reduce the likelihood of an unexpected loss of heating.

Commercial Boiler Fault Finding in Derby

Commercial boiler problems aren’t always caused by the boiler itself. Pumps, controls, system pressure, circulation and other components within the wider heating installation can all play a part.

This is why proper fault finding is important.

DHC Heating provides commercial heating services for businesses, commercial landlords and organisations throughout Derby and the surrounding area. Whether you have a boiler that repeatedly locks out, an intermittent heating problem or a commercial system that simply isn’t performing as it should, our engineers can investigate the cause and advise on the appropriate next steps.

If your commercial boiler keeps needing to be reset, don’t wait for it to stop working altogether.

Contact DHC Heating to arrange an inspection of your commercial boiler or heating system in Derby and the surrounding areas.

For a free no obligation quote or more information on our Commercial Gas Services in Derby services call:
07969265244

Alternatively you can visit : https://www.dhc-heatingltd.co.uk

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