NTI Boiler: Clean the heat exchanger and combustion chamber

Clean the heat exchanger and combustion chamber on a NTI boiler: Cleaning requires a nylon brush and an FDA-approved liquid lime scale remover. Insulation contains ceramic fiber. Wear a NIOSH-certified N95 respirator, gloves and eye protection, and dampen the lining to limit dust.

Homeowner with a boiler problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: TRX150

Common causes of clean the heat exchanger and combustion chamber

• Scale or dirt in the combustion chamber

How to fix clean the heat exchanger and combustion chamber: step by step

1. Make sure power and gas are off, and let the boiler cool before draining water.
2. Remove the silencer.
3. Disconnect the gas pipe by unscrewing its two nuts. Remove the gas pipe.
4. Remove the gas diaphragm if one is fitted.
5. Disconnect the electrical connections to the electrodes, igniter and blower.
6. Unscrew the four nuts on the burner door and remove the door.
7. Check the back wall insulation and replace it if needed.
8. Disconnect the condensate hose and siphon cap from the boiler.
9. Clean the heat exchanger with the nylon brush and lime scale remover, then rinse.

If the unit shows an error code, look it up: NTI Boiler codes

Models

TRX085TRX110CTRX150TRX199TRX199C