Replace the burner

What is going on

Burner swap on the TRX150 means pulling the cover, the combustion assembly and then the burner. Replace every seal that looks damaged, because reused seals are how combustion leaks start.

Likely causes

• Burner damaged or worn out
• Hardened or torn seals and gaskets on the combustion assembly
• Water or gas valves left open during the swap

Check in this order

1. Power off the boiler and the circuit breaker, close the gas valve and isolate the water valves.
2. Remove the front cover and pivot the electronics housing out of the way.
3. Remove the combustion assembly.
4. Remove the burner and inspect it.
5. Replace the burner and all damaged seals or gaskets.
6. Reassemble in reverse order and check for leaks, gas first, then water.
7. Fire the boiler and watch the flame and the first full cycle.

More boiler guides

• Access the low voltage wiring connections
• Blocking errors versus lockout errors
• Blower not running
• Blower runs at high speed with burner off
• Boiler bangs or hisses; Lockout 81 delta T
• Burner not running on a call for heat