06-08-2013, 09:58 AM
Tom,
Ashley and I recently replaced both of his electric heating elements, a 1650 watt 120 vac and a 4500 watt 240 vac. Well then the tank temp reading would go above 220 degrees F and the high limit thermostat would open and completely stop electric heating until it was reset.
Ashley replaced the Newel installed relay that the electric switch in the coach turns on/off and problem solved. The relay had failed with the 120 volt element always on (one leg of the two legs) no matter what the control thermostat wanted. So that one element never stopped heating the coolant tank.
The Newell relay is mounted on the front wall of the Aqua Hot compartment near the the door hinges up high near the ceiling of the compartment. It has a silver colored cover.
To diagnose this, turn the electric switch off inside the coach and then look for voltage (120 vac to ground) on each leg of the high limit thermostat. This thermostat is located behind the stainless steel cover just above the burner. It has two legs going to it and has a red reset button. With the inside switch off, both legs should show no voltage. If one does, replace the relay.
Hope this help you.
Ashley and I recently replaced both of his electric heating elements, a 1650 watt 120 vac and a 4500 watt 240 vac. Well then the tank temp reading would go above 220 degrees F and the high limit thermostat would open and completely stop electric heating until it was reset.
Ashley replaced the Newel installed relay that the electric switch in the coach turns on/off and problem solved. The relay had failed with the 120 volt element always on (one leg of the two legs) no matter what the control thermostat wanted. So that one element never stopped heating the coolant tank.
The Newell relay is mounted on the front wall of the Aqua Hot compartment near the the door hinges up high near the ceiling of the compartment. It has a silver colored cover.
To diagnose this, turn the electric switch off inside the coach and then look for voltage (120 vac to ground) on each leg of the high limit thermostat. This thermostat is located behind the stainless steel cover just above the burner. It has two legs going to it and has a red reset button. With the inside switch off, both legs should show no voltage. If one does, replace the relay.
Hope this help you.
Rudy Legett
2003 Foretravel U320 4010
ISM11 450 hp Allison 4000R
Factory Authorized Aqua Hot Repair Center
Southeast Texas Area