Omnia Mechanical Group

571 Timpson Place Bronx, NY 10455

Phone: 212-534-2500

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Boiler Not Working? No Hot Water? 15 Things to Check to Restore Function

If your commercial boiler isn’t working properly, it can be a nightmare for you as a property owner or manager. Here’s a list of things you should assess if you find the boiler not working and no hot water. Even if you wind up having to call in the pros at Calray Boilers for assistance, you’ll have a better idea of what to tell us when you place a service request. That lets us allocate more or less time as needed for repairs, and we can bring the right tools and potential spare parts as well.

Things to Check Before Calling Your Boiler Experts

Is only the hot water not working, or is the cold water also not flowing?

The first thing to check is whether or not the problem is only with the hot water. If the cold water is also not running, you have a problem with your water supply, likely from one of the following:

  • Water shut off (city citations or fines, unpaid bills)
  • Broken water main (typically a neighborhood problem)
  • Blocked water pipe (no water entering your building)
  • Clogged filter (filtration system is so clogged that it functions like a blockage)
  • Sudden drop in water pressure (e.g., fire hydrant use)

Is there no water at all coming from the tap, or is there cold water coming from the hot water tap?

No water points to a clogged or broken pipe. However, cold water coming from the hot water spigot means your boiler is likely the culprit (see below).

Are only certain units having problems?

Do certain parts of the building have no hot water, while others are fine? This means the problem isn’t with your boiler but with the distribution system. Either a major pipe supplying one segment of the building is blocked or leaking, or a valve is closed and needs to be reopened. It could also be that part of the building has poorly insulated pipes that need protecting.

Have any safety alerts or shutdowns been triggered?

Did your boiler shut down, did you hear any alarms, or have your controllers issued any alerts? This can happen if:

  • The boiler tank water level gets too low and it’s in danger of overheating
  • The boiler room gets too hot and components like pumps start to overheat
  • The boiler or controller detects kettling, surging, cavitation, or other hazardous situations
  • Smoke, carbon monoxide, or other dangerous elements are detected in the boiler area
  • Operating pressure is exceeded or close to being exceeded

In most of these situations, it’s best not to try to start up your boiler again. Instead, call your boiler service experts and wait for them to see what happened.

Do you notice any leaks?

Leaks could be due to corrosion of the tank (which often indicates other interior problems), worn gaskets or seals, loose pipe fittings, and the like. If the leak is minor and is something you can fix in-house, you may be able to remedy the problem. Otherwise, it may require the assistance of a boiler pro and/or plumber.

Is the power to the boiler operational?

Your boiler probably runs on gas but uses electricity for all its pumps and ignition. Check to make sure you don’t see or experience any of the following from the boiler’s electrical components:

  • Worn or frayed wires
  • Loose plugs or electrical outlets
  • Sparks or smoke
  • Dimming lights when the boiler turns on
  • Circuit breaker triggered

What about the water supply to the boiler?

Your water supply to the building may be fine, but what about the water filling the boiler tank? Is your boiler feeder operating properly? Sometimes the sensor that tells the feeder to activate can get stuck, causing the boiler water level to drop from lack of fresh water. If you use one boiler for heat and hot water, you could also have a problem with your condensate return lines.

What does the thermostat read?

Is the thermostat set properly for the desired temperature? When the boiler runs (assuming you can operate it), does the temperature range appear normal? It could be your thermostat is broken or has reached the end of its lifespan, meaning it “thinks” the boiler temperature is fine when it’s actually too low.

Is the boiler igniting properly?

When you turn the boiler on manually, or when it comes on automatically, does it ignite the way it should? Is the flame sufficient? Does it burn yellow or blue? You should see a blue flame; a yellow flame indicates incomplete combustion. This is often accompanied by a buildup of soot around the burner. The accumulation of soot can become so bad that it affects ignition and combustion.

Do your pumps sound normal?

Boiler systems have multiple pumps to supply fresh water to the tank, distribute heated water to taps, etc. You should know the sound of normal pump operation versus noises that sound wrong. Any grinding, shrieking, rattling, or similar sounds, as well as excessive loudness or vibration, should be reported to your pump specialist. The pump may be loose (you can try fixing any obvious loose mountings), it may need lubrication or new ball bearings, or it could be an internal problem that requires repair.

What does the boiler sound like when it runs?

Likewise, your boiler should sound normal when it runs. You don’t want to hear any sloshing, banging, or noises like gravel hitting the tank walls. These are signs of situations that will cause the boiler to shut down, like surging or kettling.

Is everything normal with your sights and gauges when the boiler is running?

You should have a baseline for what’s normal with the boiler, given to you by the manufacturer and boiler professionals. Hopefully, you are checking these parameters daily or weekly and noting readings in a log. A no hot water scenario should prompt you to double-check all your sights and gauges to see if any readings are abnormal.

Do you observe any broken, worn, hardened, or encrusted parts?

Looking at the boiler and nearby pipes, do you notice anything that indicates malfunctioning seals, broken parts, or encrustation with sediment or mineral scale? If you’re overdue for regular boiler maintenance and cleaning, you may have a clog or a leak that is affecting pressure or aspects of operation.

Is the boiler running fine, but no hot water is emanating from the taps?

Once you’ve given the boiler the once over and everything seems fine but there is still no hot water, only cold water, coming from the taps in your apartments, it’s time to look at your pipes and the outside temperature. It’s possible a main hot water pipe is poorly insulated and running along a cold wall, causing all the warm water to lose its heat before it reaches its destination. Insulating the pipe should fix the problem.

Can’t figure out what’s causing your lack of hot water? Or do you have a boiler problem that’s outside your maintenance wheelhouse?

Call Calray Boilers at 212-722-5506 or use our online form to schedule a service call. We can check all of the above for you, as well as other parts that only a professional should examine and adjust, so you get your hot water back as soon as possible.

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

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.

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The Website has strict security measures in place to protect you and your information from fraud. Once your information is provided to Omnia Mechanical Group, we strive to ensure the confidentiality of your identity and information.

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The Company provides you with the opportunity to opt-out of receiving promotional and other non-essential, marketing-related communications from Omnia Mechanical Group. 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.

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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.

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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).

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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: