Condensing Gas Boilers FAQ

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas equipment should do so.

An "EA" code displayed is an indication that the boiler attempted to ignite, but either failed to achieve combustion or the combustion was not seen by the flame sensor.

There are many potential causes of such an issue, but the most common are listed below.

1. Using a manometer, check that the static gas pressure at the boiler is within the required range;

NG: 3.5" to 10.5"

LP: 8" to 13"

If the static gas supply pressure to the boiler is outside of those parameters, please assess the gas supply to the property and the gas installation to the boiler to identify the problem and resolve.

2. When the boiler tries to fire, are you seeing a slight gas pressure drop on your manometer?

Yes: This indicates that the gas valve is at least opening, so please check the following;

• Ensure that the ignition electrodes are sparking.

• Check for loose or disconnect wires, and resolve if found.

• Check that the air supply to the boiler is adequate and free of blockage.

• Check that the condensate trap is not backed up.

• There is a diaphragm valve located within the top of the plastic air tube that runs into the bottom of the inducer fan, check to make sure that the diaphragm is not stuck.

No: Please contact our technical support team at 1-800 283 3787 Monday to Friday. The very best way to assist you would be for you to be at the boiler with your manometer, a multimeter, and a combustion analyzer.

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas equipment should do so.

The Greenstar family of boilers all come from the factory setup to run in NG gas applications.

If you are installing a new Greenstar boiler into an LP gas application, or if an existing Greenstar boiler is in a home that is having its gas supply changed from NG to LP, the boiler must be reconfigured for use with LP fuel.

1. The process requires the installation of the LP code plug that came supplied with the boiler, and then recommissioning of the boiler by using a flue gas combustion analyzer and making careful adjustments to the gas throttle.

2. A basic overview of the process can be found on this service bulletin, here .

3. For full details however, we recommend that you refer to the boiler's installation manual. If you have misplaced the manual, you can find it on this page available for download.

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas equipment should do so.

An "E9" error code will be displayed under one of two conditions:

1. The heat exchanger safety high limit switch has tripped. Please check the following potential causes;

a. Check the heat exchanger high limit switch and wiring harness for continuity or shorts, and replace if defective.

b. Check the heat exchanger to see if it is clogged internally.

c. Check the boiler water pressure to ensure that it is within 14.5psi (1 bar) when system is cold and a maximum of 21.75psi (1.5 bar) when heating.

d. Check for correct operation of the internal circulator pump. Details can be found on this service bulletin .

e. Check the bolts that hold down the heat exchanger inspection cover for correct torque. Further details are found on this service bulletin .

f. Perform a combustion test with your flue gas analyzer to ensure that the gas/air ratio is within the required specifications. Full details on the CO2 and O2 requirements, and how to measure and adjust them, can be found in the product's installation manual. If you have misplaced the manual, you can find it on this page available for download.

2. The flue gas temperature limiter has tripped. Please check for the following potential causes;

a. Check the flue gas limiter and wiring harness for continuity or shorts, and replace if defective.

b. Ensure that all connections in both the internal flue collection parts and the external flue venting installation are correctly sealed and not leaking combustion waste gases or blocked in any way.

Backflow prevention devices in the water supply (including devices installed within a water meter) can result in a build-up of water pressure that could potentially damage the boiler or other appliances in the property.

Further details can be found in this service bulletin .

As part of a complete startup commissioning of a newly installed Greenstar boiler, we recommend that the installer ensures that the circulator pump can be spun freely before filling the boiler with water.

Further details can be found on this service bulletin .

Yes.

As with all heating appliances it is important to perform all required maintenance on time and correctly.

This will ensure that the boiler continues to operate safely, efficiently, and will reduce the risk of premature failure of any component within the product.

For full details of the required maintenance actions, we recommend that you refer to the boiler's installation manual. If you have misplaced the manual, you can find it on this page available for download.