Crown boiler i have a crown freeport odv. on startup (after being dormant for 6 months), the boiler started but then chokes and dies after 3 - 5 secs. when it dies the exhaust comes back thru the front. i've cleaned the inside of boiler, new filter and new nozzle. my next step is to remove the vent pipe and inspect for blockage. anything else i should inspect. my service call is 7 days away.

Follow this chart troubleshooting and fix it. God bless you
est and replace a high-limit cutoff:

1. Disconnect power to the heater at the electrical panel and post a sign warning others not to turn it on.
2. Remove the upper access panel and push the reset button.
3. Replace the access panel and turn the power back on. If the water is hot, the reset was the problem. If not, you'll need to turn the power off again and reopen the access panel.
4. Use a multimeter to test the cutoff terminals for continuity. If faulty, replace with an exact replacement part.

1. Shut off power at the electrical panel and post a sign warning others not to turn it on.
2. Close the cold-water supply valve and open a hot-water faucet somewhere in the house (to speed draining).
3. Attach a garden hose to the drain valve and run it outside the house.
4. Open the drain valve and allow all water to drain out.
5. To refill the tank, close the drain valve tightly and open the cold-water supply valve. Also open a nearby hot-water faucet. When a steady stream of water flows from that faucet, the tank is full and the faucet can be closed.
6. Once the tank is full, turn the electrical power back on.

1. Lift the spring lever on the valve to fill a small cup. Check the cup for sediment.
2. If no water spurts out, or if water continues to drip after the valve is released, replace the valve.
3. Cut power at the electrical panel and post a sign warning others not to turn it on. Close the cold-water supply valve.
4. Drain a few gallons of water from the tank.
5. Unscrew and remove the discharge pipe if used.
6. Loosen the relief valve with a pipe wrench, then remove the valve by hand.
7. Apply pipe tape to the threads of the replacement valve and screw it into the tank by hand. Tighten it with a pipe wrench. Screw the discharge pipe (if any) into the valve outlet.
8. Refill the water heater and restore electrical power.

1. Shut off power at the electrical panel and post a sign warning others not to turn it on.
2. Close the cold-water supply valve and drain the water heater completely (see above).
3. Unscrew the drain valve with a pipe wrench.
4. Replace the drain valve with an identical unit wrapping the end with pipe tape.
5. Refill the tank and restore electricity.