Snowdlyn Posted May 12, 2013 Report Share Posted May 12, 2013 We have a Laars LT 400 pool heater with a flashing pressure switch. The heater does not fire up. It seems we may need to replace the pressure switch? Where is it located in the heater? The diagram is confusing to say the least. Quote Link to comment Share on other sites More sharing options...
Pool Clown Posted May 12, 2013 Report Share Posted May 12, 2013 What does the pressure gauge on the filter read? Quote Link to comment Share on other sites More sharing options...
Snowdlyn Posted May 13, 2013 Author Report Share Posted May 13, 2013 15psi Quote Link to comment Share on other sites More sharing options...
Bugman1400 Posted May 14, 2013 Report Share Posted May 14, 2013 The pressure switch is the round device that has a hose (the diameter size of a pencil) connected to it. If you are 100% certain there is water flowing through the heater then you can jumper out the pressure switch. If the heater still doesn't fire, you've got other issues. Quote Link to comment Share on other sites More sharing options...
Pool Clown Posted May 14, 2013 Report Share Posted May 14, 2013 it is also possible that you have some corrosion in the tube. Disconnect the switch from that tube, then turn the filter pump on and see if you get a good stream of water out the tube. Quote Link to comment Share on other sites More sharing options...
Bugman1400 Posted May 15, 2013 Report Share Posted May 15, 2013 it is also possible that you have some corrosion in the tube. Disconnect the switch from that tube, then turn the filter pump on as see if you get a good stream of water out the tube. That reminds me that I've seen corrosion on the orfice to the switch.....because that hole is small and the pool water either reacted with the switch metal case or the pool water just left deposits around the hole. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.