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Navien combi boilers are a popular choice for many homeowners, providing both hot water and home heating in one unit. Unfortunately, like any other appliance, they can suffer from problems. If your Navien combi boiler is not heating your home, there are a few steps you can take to troubleshoot and hopefully fix the issue.

The first step is to check the boiler's pressure. If the pressure is too low, the boiler won't be able to heat your home properly. To check the pressure, locate the pressure gauge on the boiler and make sure it's in the green zone. If it's not, you'll need to add pressure to the system. This can be done by opening the filling loop, which is usually located near the bottom of the boiler.

If the pressure is already in the green zone, then the next step is to check the thermostat. Make sure it's set to the correct temperature and that the system is in heating mode. If it's not, then change the mode and the temperature setting. If the thermostat is already set correctly, then you may need to reset the boiler. To do this, switch the boiler off and then back on again.

If the pressure is good and the thermostat is set correctly, then the next step is to check the boiler's ignition. If the ignition is not working, then the boiler won't be able to start heating. To check the ignition, locate the pilot light and make sure it's lit. If it's not lit, then you'll need to relight it.

If the pilot light is lit, then the next step is to check the boiler's filters. If the filters are clogged, then the boiler won't be able to circulate enough air and the heat won't be distributed properly. To check the filters, locate the filter cover and remove it. Then, take out the filter and inspect it. If it's clogged, then you'll need to replace it.

If the filters are clean and the pilot light is lit, then the next step is to check the boiler's flue. If the flue is blocked, then the boiler won't be able to exhaust the heat properly. To check the flue, look for any signs of blockage, such as soot or debris. If you find any, then you'll need to clean the flue.

If the flue is clean and the filters are clean, then the next step is to check the boiler's heat exchanger. If the heat exchanger is blocked, then the boiler won't be able to heat the water properly. To check the heat exchanger, locate the inspection cover and remove it. Then, inspect the heat exchanger for any signs of blockage. If you find any, then you'll need to clean the heat exchanger.

If the heat exchanger is clean and the flue is clean, then the next step is to check the boiler's gas supply. If the gas supply is not working properly, then the boiler won't be able to heat the water. To check the gas supply, locate the gas valve and make sure it's open. If it's not, then you'll need to open it.

If the gas supply is working properly and the heat exchanger is clean, then the next step is to check the boiler's safety devices. If the safety devices are not working correctly, then the boiler won't be able to heat the water. To check the safety devices, locate the safety valve and make sure it's open. If it's not, then you'll need to open it.

If the safety devices are working correctly and the gas supply is working properly, then the last step is to check the boiler's ignition system. If the ignition system is not working, then the boiler won't be able to start heating. To check the ignition system, locate the ignition switch and make sure it's in the "on" position. If it's not, then you'll need to switch it on.

If all of these steps have been followed and the boiler is still not heating your home, then it's time to call a professional. A qualified technician will be able to diagnose and repair the issue quickly and safely.

Navien combi boilers are a great choice for many homeowners, but like any other appliance, they can suffer from problems. If your Navien combi boiler is not heating your home, then there are a few steps you can take to troubleshoot and hopefully fix the issue. Check the boiler's pressure, thermostat, ignition, filters, flue, heat exchanger, gas supply, and safety devices. If all of these steps have been followed and the boiler is still not heating your home, then it's time to call a professional.