What does an error code on my tankless unit mean?

Error codes point to a specific issue, but the exact meaning varies by manufacturer and model. A technician can identify what your unit's code indicates.

Why has my tankless unit's hot water output decreased?

This can point to a few different causes, including a component issue or a unit that needs maintenance. A technician can diagnose the actual cause.

Should I repair my tankless water heater or replace it?

It depends on the unit's age and the specific problem. A technician can give you an honest read on whether a repair makes sense or whether replacement is the better choice.

How quickly can McQuillan repair my tankless water heater?

Same-day service is often available. A technician can give you a clearer estimate of timing based on your situation.

Does McQuillan offer free estimates for tankless repair?

Yes. McQuillan provides a free in-home estimate for tankless water heater repair.

How does McQuillan price tankless water heater repair?

McQuillan uses upfront pricing. You will see a quote before any repair work begins, and you'll never pay more than you're quoted.

Tankless Water Heater Repair in the Twin Cities

Nate our technician was informative and friendly. He checked our boiler over and made sure it was ready for winter and functional. Communication on our service window via the text system was poor. We were able to make same week appointment. Clear options with price points on possible future services and upgrades to our systems were presented to us. Technician good. Service good. Late appointment after the window was ok but not getting any update and having to call thinking no one was coming...

Jennifer Piens

26 days ago

The technicians diagnosis took a few days. They listened and explained how to resolve our situation very well. This is our first experience with McQuillan. We are impressed by the knowledge and level of service. A big thank you!

Candace Sweet

Oct 13, 2026

The appointment was set up very quickly, and the professional came to my door with a smile. He was warm and friendly, but also professional in his regard for all the things I need done for my basement bathroom. He provided an estimate within a half hour of his arrival and I was grateful I will have to make difficult decisions because I was impressed by your service thank you and thank him please Mary.

Mary Ticiu

Oct 08, 2026

I had a great experience working with Tony from McQuillan Home Services LLC! He was professional, knowledgeable, friendly, and easy to communicate with. He took the time to explain everything clearly and made the entire process smooth and stress-free. I really appreciate his professionalism, attention to detail, and excellent customer service. I highly recommend Tony and McQuillan Home Services to anyone looking for reliable and quality service!

Yohanis Hundessa (Yone)

Oct 08, 2026

Tony is one of the absolute best technicians I have worked with across any company or industry. He is personable, professional, polite, and extremely knowledgeable about the products and services he provides. He took the time to explain everything clearly and made the entire experience easy and stress-free. Because of Tony, I will only use McQuillan for my plumbing needs. McQuillan is fortunate to have someone of Tony’s caliber representing their company. Highly recommended!

MICHAEL FUERST

Jun 09, 2026

5/5 Stars Highly recommend! Tony was professional, punctual, and diagnosed the issue right away. They fixed everything quickly, left the work area completely clean, and charged a fair price. It’s hard to find reliable service these days, and I will definitely be using them for any future plumbing needs.

Gina Ramos

Jun 04, 2026

Great service. We have an issue with low water pressure and Zach looked over our plumbing and helped determine where the problem could be coming from. Zach went above and beyond what we expected and he was very knowledgeable and professional. He also identified some older gate valves that were needing to be replaced in the near future. He didn’t try to sell us on doing the work but instead provided us a competitive quote and told us we could call if/when we decided to have the work done. We...

Josh “JP” Peterson

Apr 16, 2026

Awesome service! Great that a little background profile information was provided about the technician that was coming out. This provided welcoming feeling as to who will be on site to do the service. We cannot find words to express how Technician Adam H. came out to diagnose our electrical issue. After patiently listening to the entire story about a portion of the house has no electrical power... he was able to find out the issue outside. Adam took his time to explain the entire power...

Chueyee Moua

Feb 25, 2026

We had two projects completed recently and will be sure to call McQuillan again when our need for their services arises. First we had a furnace replaced. The work was professionally done. The crew was all hands on deck and diligent in completing the job in a timely manner. It looks and works great. Next we replaced an old laundry tub and the technician who arrived was able to diagnose the fix and complete the project same day. In both cases, the old units were completely removed, saving me a...

Chas. Jensen

Jan 10, 2026

Should you do it yourself?

One simple thing you can reasonably do yourself is noting any error code shown on the unit's display before calling for service, since it can help point to the issue.

Diagnosing and repairing ignition components, the control board, or the heat exchanger calls for a professional. A McQuillan technician can take it from there once you've noted what the unit is showing.

DIY versus Hiring a Pro
An Honest Comparison	DIY	Hiring a Pro
Time	Minutes to note an error code	Often available same-day
Real Cost	Just your own time	Upfront quote before work
Insurance	Not typically applicable	Provides a documented service record
Warranty	Not typically applicable	Backed by our workmanship
Safety	Safe for observation only	Trained to diagnose and repair tankless components safely

DIY versus Hiring a Pro

An Honest Comparison

DIY

Hiring a Pro

Time

Minutes to note an error code

Often available same-day

Real Cost

Just your own time

Upfront quote before work

Insurance

Not typically applicable

Provides a documented service record

Warranty

Not typically applicable

Backed by our workmanship

Safety

Safe for observation only

Trained to diagnose and repair tankless components safely

Tankless Water Heater Repair

Here's how a tankless water heater visit goes with us.

Background-checked, drug-tested

The price before the work

Answered around the clock

St. Paul since 1883

Be the next happy customer

If it’s not right, we’ll make it right.

We guide. You decide.

Tankless Water Heater Evaluation