Omnia Mechanical Group

571 Timpson Place Bronx, NY 10455

Phone: 212-534-2500

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The Most Common Boiler Failures and Causes: Prevent These Boiler Problems Before They Cause Trouble

Boilers are essential components of residential and commercial properties. When something goes wrong with the system, it can cause dangerous problems. That said, most common boiler failures and causes are preventable with regular maintenance. Discover the most common boiler problems and how routine inspections — performed by licensed professionals — can prevent them.

8 Most Common Boiler Failures and Causes

1. Low Boiler Pressure

Your property portfolio may include buildings with combi-boilers, heat-only boilers, or system boilers. Each type can experience low pressure, but the symptoms may vary. A failing combi-boiler might produce cold radiators and a lukewarm water supply, while a traditional boiler only affects the radiators.

Boilers have displays or dials that show the current pressure level of the system. The correct level depends on the specific boiler. It is best to leave diagnoses and repairs to professionals.

When a system’s pressure is low, there are two likely culprits: a leak or a bleeding radiator. A leak means there is not enough water in the boiler to maintain adequate pressure, causing it to drop. A bleeding radiator refers to an air leak but can also refer to an intentional process to relieve too much pressure in the system.

2. Frozen Pipe

A condensing boiler features a waste water pipe to the outside of the property. The water, or condensation, is produced during the heating process. In the colder months, the water in this line may freeze before exiting the property. As a safety precaution, the boiler then shuts down to prevent damage to the system.

A frozen condensate pipe is among the most common boiler failures and causes. It is easy enough to fix: You can pour warm or hot water into the pipe to melt the ice. Still, it is best to hire a licensed boiler engineer or technician to assess the problem. Sometimes a frozen pipe can cause other issues, like fractures in the line.

3. Leaks

Boiler leaks are common and a nuisance. Depending on the severity of a leak, it can cause significant water damage. Also, it can damage electrical components, causing system malfunctions. Because of the potential severity of property loss, always consider leaks serious matters.

Leaks can occur for several reasons. The most common causes include:

  • – Faulty components
  • – Corrosion
  • – Poor seals
  • – Excessive pressure

Never attempt to repair a leak on your own. Boilers are delicate and dangerous pieces of machinery. Always contact a qualified engineer to assess and repair any damage.

4. No Heat But Hot Water

Among the most common boiler failures and causes is when there is no heat but still hot water. This is a common problem with combi-boilers especially. The cause is often forgetting to reset the system after the summer months. During the warmer seasons, property owners may switch the units to hot water only. Property owners may also set the boiler to shut down at specific times. The system display should show if presets or programming is the culprit.

Another plausible explanation is too much air in the radiators. The only way to relieve trapped air is by bleeding the system. While there are DIY options, for the sake of your boiler, hire a licensed professional.

5. No Heat and No Hot Water

When a boiler stops working at all, property managers play the worst-case scenario game. They think about the hassle of new installations rather than choosing optimism. If a boiler isn’t producing heat or hot water, something is wrong. Still, it doesn’t mean the entire system needs replacing. A boiler may stop working for several reasons, such as:

  • – Disconnection from the water, power, or gas supply
  • – Too much or too little pressure
  • – Piping problems

Because the most common boiler failures and causes have many explanations, it is best to hire a professional. Licensed technicians can prevent significant costs when called upon for regular maintenance.

6. Kettling and Other Strange Noises

Kettling is when trapped steam and air create a whistling sound from the boiler. The noise occurs because water is heating too quickly and reaching its boiling point. The likely cause of kettling is limescale buildup, which slows the water flow into the system. A restricted flow means less water in the boiler and quicker heating.

Whistling is not the only strange noise a boiler can make. Other common sounds include:

  • – Humming
  • – Gurgling
  • – Whooshing
  • – Droning

While noises may not indicate immediate danger, they suggest something is wrong. A professional can diagnose the sound, determining whether it stems from mineral deposits, faulty pumps, debris, trapped air, or something else.

7. Boiler Switching Off

Most common boiler failures and causes stem from poor maintenance. When this equipment does not receive regular service, many issues can arise, from a pressure buildup to the collection of debris or sludge. Such issues can cause the boiler to switch off at various moments.

Boiler systems include safety features that can interrupt normal operations when sensing something amiss. If the system keeps switching off and on, contact Calray Boiler to investigate.

8. Pilot Light Problems

Combustion operations for newer boilers typically rely on atmospheric or power burners. If you have an older boiler, though, it may have a pilot light. Pilot lights are notorious for causing problems, often blowing out, making the boiler burner useless.

While pilot lights can blow out, it should not happen too often. When the flame goes out frequently, it may indicate other problems, like a faulty thermocouple.

Do not attempt to repair or replace the faulty component on your own. The project requires the removal of the boiler casing, which requires professional assistance.

You can ensure the problem is not a supply issue by testing other gas appliances in the building. If other appliances work, contact a licensed technician to assess the boiler system.

Hire the Pros To Diagnose Most Common Boiler Failures and Causes

Calray Boilers Is Here To Help

The most common boiler failures and causes may not be obvious to the average property manager. Even if they are apparent, correcting boiler problems requires expert knowledge and skill. If your boiler is not operating as expected, contact Calray Boilers at 212-722-5506.

Our Privacy Policy

Omnia Mechanical Group(the “Company”) strives to ensure the highest standards for property listings and customer information privacy. Please review the following statement to learn about our company practices and policies. Please be aware that our Privacy Policy is subject to change at any time.

1. Purpose.

This Privacy Policy (“the Policy”) provides information on how the Company uses your personal information. By agreeing to the Policy, you agree to our collection and use of your personal information as described in the Policy. This Privacy Policy is effective for all new users of

2. Personal Information.

You can browse some areas of (“the Website”) without being a registered user. However, certain activities do require registration. (You consent to the transfer and storage of your information by registering with We may collect and store the following personal information:

  • Name, email, address, telephone number, and (depending on the service used), move-in dates;
  • Transactional information (such as lease terms, lease parties);
  • Computer sign-on data, statistics on page views, and traffic to and from the Website; and
  • Other information, including IP address and other web log information.

3. Use of Information.

Our primary purpose in collecting personal information is to provide you with a safe and user-friendly experience. For example, the Company may use your personal information to:

  • Improve our services and the Website’s content and layout;
  • Provide the services and necessary customer support you request;
  • Resolve disputes, collect fees, and troubleshoot problems;
  • Track and record customer satisfaction with our services;
  • Protect the Company against error and fraud;
  • Inform you of special promotions and announcements;
  • Enforce our agreements, terms, conditions, and policies; and
  • As otherwise described to you at the time of collection.

We may occasionally ask you to complete optional surveys. These surveys are used to improve and customize your experience with

The Company always provides you the ability to opt-out of further communication such as promotions and surveys; see the Opt-Out section below.

The Company does not share any of your personal information with outside organizations, companies, individuals, etc. The only exception to this standard is if such a disclosure is reasonably necessary to respond to any and all legal processes.

4. Links to Other Sites.

The Website may have links to other websites that may collect personally identifiable information about you. The Company is not responsible for the privacy practices of the content of those linked websites.

5. Safety & Security Precautions.

The Website has strict security measures in place to protect you and your information from fraud. Once your information is provided to Antler Pump & Motor Corporation, we strive to ensure the confidentiality of your identity and information.

6. Opt-Out.

The Company provides you with the opportunity to opt-out of receiving promotional and other non-essential, marketing-related communications from Antler Pump & Motor Corporation. If you would like to opt-out of these select communications, please see any of the Company’s email communications and follow the directions indicated.

7. Account Protection.

Your password ensures the security of your account. When choosing a password, the Company suggests using various characters. It is highly recommended that you do not disclose your password to anyone. (If you do disclose your password or your personal information with others, you are responsible for all actions taken in the name of your account.) If the security of your password is compromised for any reason, please contact the Company immediately.

8. Accuracy of Information

The Company does not guarantee the accuracy of information for any and all of its properties on the Website, and is not responsible for any errors or misrepresentations (made by Renters, the Client, or otherwise).

9. Cookies

The Company may place a small cookie on your computer’s hard drive. This allows us to personalize your use on the Website. In order to maximize the functionality and usability of the Website, you must set your browser’s preferences to allow both permanent and temporary cookies.

10. Changing Your Personal Information.

Should your personal information change, please immediately update your information on the Website. This will ensure the accuracy of our records. The Company does retain personal information from closed accounts in order to comply with law and collect and disburse any fees owed.

11. Third Parties

This Privacy Policy addresses only the use of information we collect from you. Since does not control the privacy policies of third parties, you are subject to the privacy policies of those third parties. It is advisable that you consult with the management of third parties before you disclose your personal information to others.

12. General

We may amend this Privacy Policy at any time by posting the amended terms on the Website. All amended terms are immediately effective after they are initially posted on the Website.

13. Privacy Policy Questions & Concerns

Questions and/or concerns regarding the Policy should be emailed to the following email address: