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SECTION IX
TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
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