Hubbell CR User Manual

 

 

15

Circuit breaker tripped at 
source. 

Reset circuit breaker. 

On/Off switch in ‘OFF’ 
position, if installed. 

Turn switch to ‘ON’ position. 

Circuit breaker at control 
cabinet tripped, if installed. 

Reset circuit breaker. 

Blown fuse in element fuse 
block, if installed. 

Replace fuse. 

Blown fuse in transformer, if 
installed. 

Replace fuse. 

High limit switch tripped. 

Reset high limit switch.  

Loose wires. 

Tighten wires. Torque screws per 
torque chart included in Section 
VI. 

Heating element inoperable. 

Check heating element operation 
by clamping an Amprobe around 
each wire to the element. The 
ampere reading should agree with 
the nameplate ‘AMP’ figure. 

Low line voltage. 

Have source electrical system 
checked by an electrician. 

Faulty thermostat. 

Move thermostat dial through full 
range. A definite ‘click’ should be 
heard. If not, replace thermostat. 

Faulty low water cut-off, if 
installed. 

Check to see if tank is full of 
water. If not, fill tank. If problem 
continues and tank is full, check 
for continuity between the 
common and normally open 
contact of the relay board. If 
continuity is not observed, replace 
low water cut-off. 

No hot water 

Magnetic contactor does not 
energize. 

Replace complete magnetic 
contactor. Because of the  design 
of this particular contactor, it is 
more desirable to replace complete 
control rather than rebuilding coil, 
contacts and springs, etc.