Bradford-White Corp EF Series Manual De Usuario

 

41

 
Main power light is not lit. 

Make sure that water heater is plugged in. 
 
When the switch is on, is there 120VAC between L1 and 
N on the terminal block?  If not, then check for loose 
wire connections on the “Power Switch Wire Harness.”  
If connections are ok, then replace the switch. 
 
If there is voltage between L1 and N then the light on 
the switch is burnt out.  Replace switch 

Thermostat does not call for heat 

Make sure that the temperature of the tank is cool. 
 
If the thermostat does not call for heat, then check the 
PRIMARY voltage across the “Transformer”.  If there is 
voltage across the PRIMARY, then check the voltage 
across the SECONDARY leads of the “Transformer”. 
 
Install a jumper wire from N.O. terminal to the COM 
terminal on the “Thermostat PC Board.”  If the 
thermostat calls for heat after installing a jumper wire  
then check the “Thermostat Sensor Probe” leads for 
proper resistance with an OHM meter (See appendix A).  
 
If sensor reading are not correct, replace  “Thermostat 
Sensor Probe.” 
 
If the sensor readings are correct, then check 
“Potentiometer” for the proper resistance.  If the 
readings are correct, then replace the “Thermostat PC 
Board”, otherwise replace the “Potentiometer.” 

Ignition module “Power” LED is not lit 

Check for 120 VAC  at the ignition module on “120 
VAC IN.”  If there is voltage, then replace the ignition 
module. 
 
If there is not any voltage, check the voltage across the 
transformer as previously described. 

Blower does not energize 

Is the “Vacuum Switch” (air intake switch) N.C.? If no, 
then check the hose and see if it is filled with 
condensate.  If the hose is not filled with condensate, 
then replace vacuum switch.  If filled, empty hose. 
 
Is the “Pressure Switch” (exhaust pressure switch) N.O.? 
If no, then check the hose and see if it is filled with 
condensate.  If the hose is not filled with condensate, 
then replace pressure switch.  If filled empty hose. 
 
Is the “Collector Limit Switch” N.C.? If no, then reset 
switch.  If this switch trips more than 3 times,  call 
service. 
 
If all items above are ok, then replace the blower. 
 

Ignitor does not glow 

Is there voltage to the “Hot Surface Ignitor”?  Check for 
120VAC to the ignitor from the ignition module.