Update to my original post below. I may have misdiagnosed the original issue. AFter checking the blower and fixing the air sensor on the post side of the blower I still have the same issue. It runs for several minutes and then something clicks or appears to try and shut down the heater. The flames almost die out and then it clicks again and the flames pick back up and starts to run normally again. Not sure if the click is the gas valve opening and closing, a sensor, or the heater ignition re-firing. If it was a sensor I would think I should get some kind of diagnostic failure code. I never get a code and the unit never shuts down. The Green heater light stays lite as if its functioning normally. The unit is hooked to an auto cut off device (stingl 500) per the new Virginia Baker act. The only interaction between the 2 devices is a line spliced into the water pressure switch sensor wire. I am assuming this is to only allow the heater to operate if the Vacuum cut off device is in the proper run mode or turned on and running the filter.
Any ideas or suggestions? Has anyone had this issue?
Any ideas or suggestions? Has anyone had this issue?
I have been troubleshooting an H400 series Hayward heater. Electric (non millivolt) H400 series. Newer version with Digital control panel. I find a lot of information regarding the older models but not the newer version. My H400 was purchased about 4-5 years ago. Its been used 3 seasons.
I may have 1 or possibly 2 problems. The other day I cleaned the burners out real good. They were clogged and had a lot of build up. I Checked the heat exchanger and it looks ok. I Placed the heater back together and it started perfectly. So quiet I didnt even think it started. It burned perfectly for 5 minutes then the blower would make noise like it was pulling or having trouble venting. Almost like It was trying harder and bogging down. The heater starts making a clicking noise as well. Sounds like its relighting the burner. Fan noise and Flame height start to go up and down, up and down, etc... Until you turn it off or place it in standby.
So to recap it will ignite normally after being turned off for a while but then after running a while and shutting it off it will only ignite after several tries with a large poof! It eventually ignites but its like a mini explosion.
The other issue is the fan seems to bog down or not be able to vent after running for a few minutes. The up and down flame issue described above goes along with this. I tested the 2 hose lines that connect to the fan housing and when I apply pressure to the line one of the lines makes a healthy clicking noise as if the diaphram is working and the other does not. They both hook into the same round shaped type of Diaphram device. I believe they simply detect air flow. I believe this part could be bad and if so would it cause this issue?
If so does anyone have the part # for the Diaphram? Both are sensors to make sure the fan is running but I cant find them on a parts list. I tested both by applying very little pressure to the hose via my mouth. Where can I find the part number or description. I downloaded the manual but it doesnt list this particular part.
Thanks in advance!
Steve