Campo

As far as I know the water pump circulates all the time. The thermostats turn the fans on and off. The burner only comes on for ten...

The pump was a U4810 and I replaced with a new U4810. The boat is a 37' Trip cabin Trawler so there is somewhere around 70 to 80 feet...

I have a pressure tester that attached to the radiator cap. Mine tested good-no leaks.

What makes it difficult is that air in the hose might not completely stop the flow, but rather slow it down. I could see the partial air...

I have 3 thermostat zones but they just control the fans. The hydronics are 1 continuous loop going through 7 radiators 3 of which have...

Before I would take the hammer to my good condition heater hose, I would try to power bleed the system using the existing pump...

I have 3 thermostat zones but they just control the fans. The hydronics are 1 continuous loop going through 7 radiators 3 of which have...

My system has heater hose not PEX and it is in good condition. There are 3 bleed screws. I will try beating with a hammer to move the...

If it was working before the rebuild, you definitely have an air lock. Do you have pex or heater hose? You will get air locks at dips...

May have to do some more bleeding. Thanks for the advice.

The problem may be an air lock. Start at the highest and farthest air handler (radiator) in the system in relation to the circ pump...

Had the same set up with a high point in the hose, but no vent or check valve. Mine also one day started backfilling the holding tank...

I used an electric transfer pump and filled up 5 gal buckets

Thank you for your reply. Yes I have the finned coils with the computer fans. I replaced two of the fans. I did not clean the coils...

I have a Webasto hydronic system with 7 radiator total. I had the heater rebuilt, replaced the circ pump bled the air and it still...