Bradford-White Corp Solar Water Heater User Manual

24 

 

ECO on thermostat tripped 

Determine if ECO trip is a result of excessive solar heat or 
electric element.  Correct or replace as necessary. Depress red 
“RESET” button on thermostat  

Improper thermostat setting 
or calibration 

Adjust tank thermostat to appropriate setting 
See Section VII 
Check electrical connections 
Check that proper valves are open 
Check that system is bled 

Circulator does not pump 
fluid through solar collector 

Replace as necessary 
Check fuse and replace 

Check circuit breaker and reset (if applicable) 

Electrical problem (Control, 
wiring, etc.) 

Check power supply 

Scale build-up 

If solar controller, collectors, circulator, and tank are operating 
satisfactorily, coil may have scale coating.  See Section VIII: 
Maintenance 

No hot water at 
faucet 

Clogged cold water filter  

Clean or replace filter or strainer 

Thermostat set too high 

Adjust thermostat setting.  See Section VII 

Improper system plumbing 

Compare plumbing to Section V 

Improper system wiring 

Compare wiring to Section VI 

Water at faucet 
too hot 

Mixing Device temperature 
set too high 

Adjust Mixing Device setting.  Refer to Mixing Device 
instructions. 

Thermostat setting too low 

Adjust thermostat to higher setting.  See Section VII 

Undersized solar collectors  

Review calculations for proper collector surface area, 
orientation and available sunlight 

Faulty solar sensor or solar 
controller 

Check connections, power and sensor resistance.  Replace as 
necessary. 

Peak use of hot water is 
greater than tank storage 
capacity 

Determine peak usage and compare to tank capacity 

Check electrical connections 
Check that proper valves are open 
Check that system is bled 

Circulator does not pump 
fluid 

Replace as necessary 

Insufficient hot 
water 

Faulty tank thermostat 

Replace thermostat