Heating Systems thermostats

How To Troubleshoot a Weil Mclain Boiler And Its Common Problems

Weil Mclain is a leading North American Manufacturing company. It deals in the manufacture of hydronic comfort heating systems. Their heaters are popular for residential, commercial, and institutional buildings. The Weil Mclain brand, one of the most respected and is often used in the industry.

Weil Mclain Boiler

The company founded in 1881 in Chicago by Isador and Benjamin Weil. It originally named Weil Brothers. It later renamed in 1918, after a change of supplier. Throughout the 20th century, Weil Mclain grew to be the largest US manufacturer of cast iron boilers and hydronic industry.

It has several manufacturing facilities and regional offices all over the United States, such as

  • Michigan City
  • Indiana
  • Eden, North Carolina
  • Burr Ridge, Illinois.

The Weil-Mclain Boiler heating systems installed in homes, offices, schools, restaurants, hotels, and other facilities all over North America.

Weil Mclain Boiler features

A boiler used for two things either to produce hot water or steam.

  • Hot water used for domestic use or commercial heating and hot water supply.
  • Steam Boilers used to power turbines and other industrial heating applications.

Weil Mclain makes a very balanced lineup of gas condensing, gas, and oiler boilers. They have four available kinds: Evergreen, AquaBalance, WM97+, and ECO. All these are extremely efficient boilers.

Below is a list of some attractive features of Weil Mclain boilers:

  • Their Hydronic Boilers are available in a wide assortment of styles and materials to fit installation and use requirements.
  • Their Heat Exchangers made of stainless steel or cast aluminum.
  • The gas and oil boilers use water and/or steam to deliver heat.
  • They have an average efficiency of 93%.
  • Weil-McLain boilers manufactured with elastomeric seals over a captured port for proper positioning.
  • Weil-Mclain Boiler WM97+ CT has a unique condensing stainless steel fire tube heat exchanger design. This helps in catching water heat, which would be lost normally.

Weil-McLain  Boilers Common Problems

Weil-McLain boilers come with a 10-year non-prorated heat exchanger warranty for commercial boilers. The residential boilers have a 12-year non-prorated heat exchanger warranty. It has a two-year parts warranty for both categories.

The boilers can last for 15 years or longer, with proper maintenance. It can face several common issues during this time, such as:

  • No heat at all

The Thermocouple burned out and not respond to the thermostat’s call for heat.

  • Little or no heat

Sometimes insufficient water pressure can prevent the boiler from creating an adequate amount of heat.

  • The Boiler Cycles On and Off Frequently

In such a case the boiler turns on, runs a short cycle, and turns off. It seen if the home temperature starts fluctuating too much.

  • No heat or too much heat in a zone

If a certain area of the house is getting too much heat or no heat at all, the zone valves can be faulty.

  • Carbon Monoxide alarm triggered

There should be a CO detector near the boiler, low to the ground. Its alarm triggered if there is a large amount of Carbon Monoxide.

Tools to solve problems in Weil Mclain Boiler

The user should have a few of these tools before attempting to solve any issues>

  • The owner’s manual
  • A screwdriver set
  • Flashlight or headlamp
  • Handheld Mirror
  • Voltmeter
  • A set of small wrenches
  • A long barbeque grill lighter

How To Troubleshoot a Weil Mclain Boiler

After collecting all essential supplies, users can begin troubleshooting. It should be kept in mind to follow all safety precautions before doing so:

  • No heat at all

If the boiler does not crank even after increasing the heat up. It’s time to check the thermocouple.

  1. Access the panel by removing the cover.
  2. Locate and remove the thermocouple by unscrewing all the nuts.
  3. Connect the Voltmeter to the thermocouple, using the extending wires.
  4. Hold the Thermocouple with a plier, in case it gets hot. Ignite the light and heat the Copper.
  5. If the Voltmeter spikes, then the thermocouple is working.
  6. If it does not spike, the problem is with the thermocouple.
  • Little or no heat

The most common cause is low water pressure.

  1. Check the pressure gauge on the boiler.
  2. If the pressure is too low, add water until the right pressure is registered on the gauge.
  3. If there is a leak, call a service technician,

Weil Mclain Boiler Troubleshooting

  • The Boiler cycles on and off frequently

If the house is too hot or too cold, then this could be the reason.

  1. The house can be too hot if the thermostat is outside or near a drafty window. In such a case it should be moved to a dry place inside.
  2. The house can be too cold if the thermostat is in direct sunlight or near a heat source. It should be moved in such a case.
  3. If it’s an old boiler increase the boiler’s upper-temperature limit.
  4. If this does not stop the short cycling, call a technician.
  • No heat or too much heat in a zone

Make sure the thermostat setting for each zone is where it should be. If one zone is still too hot or cold, an electronic zone valve needs to be replaced.

  • Carbon Monoxide alarm triggered

The most common cause for this is the plugging of the boiler heat exchanger fins with dirt and debris.

  1. If the CO alarm goes off then the doors and windows in the house should be opened, to be safe.
  2. Call a boiler technician from outside.

There are several risks associated with boilers, like

  • Severe burns
  • Gas explosion
  • Risk of shock

These should be kept in mind before proceeding. If there is a risk of injury, the job should be left with a professional service person.

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