Hubbell Electric Heater Company ME ユーザーズマニュアル

 
 
 
 

 

14 

Circuit breaker tripped at source.  Reset circuit breaker. 
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. 

No hot water 

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. 

Faulty thermostat. 

Check thermostat adjustment. Monitor 
thermostat as described in Section III, 
Quarterly Inspection. Replace if necessary. 

Heating element not working on 
all phases 

Check to see that heating element is 
working on all phases, by checking the 
resistance (ohms) value for each element 
and comparing with the chart included in 
Section VI. 

Water temperature 
below settings at all 
times 
 

Heater improperly sized 

Verify heater is properly sized for the flow 
rate and temperature rise of your system. 
See formulas included in Section VI. 
Replace elements with proper size as 
necessary. 

Relief valve 
discharges 
continuously 

Excessive temperature or 
pressure in tank 

Temperature and pressure relief valves are 
made to operate if the water temperature 
exceeds 210

°F or water pressure exceeds 

the pressure rating of the safety relief valve. 
If trouble is excessive temperature, then 
thermostat is not shutting off at the right 
setting and thermostat must be replaced.