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PROBLEM
No hot water
Not enough hot water
TROUBLESHOOTING
CHECK THIS
Storage water heater
Storage water heater
thermostat
Thermostatic mixing valve
Storage water heater
Check valve
Cold water supply dip tube
Collectors
Differential Controller
POSSIBLE CAUSE
No power to auxiliary back-up
heating element
Thermostat defective
Improper adjustment
Valve defective
Undersized for hot water
demand load
Thermostat set too low
Element failure
Thermostat failure
Element disconnected
Heat loss due to defective
check valve in solar pump
station
Missing or defective
Absorber coating degradation
Collector panel area
undersized
Excessive condensation
Glazing dirty
Leaks
Orientation
Shaded by tree(s) or other
obstructions
Improper tilt
Improperly plumbed
Improper operation (cycling,
late turn on)
Faulty sensor
is shown and control
reads 888.8 instead of
temperature
Faulty sensor
is shown and control
reads -88.8 instead of
temperature
34
CORRECTIVE ACTION
Check high temperature
protection and push reset
button on the heater
thermostat. (Use caution when
dealing with electricity.)
Replace
Check water temperature at
house faucet and adjust valve
setting
Replace. System must not
be run without thermostatic
mixing valve due to scald risk.
Replace
Increase set point temperature
Replace element
Replace thermostat
Reconnect element and set
thermostat to 120°F
Inspect valve and repair or
replace
Replace dip tube
Replace collector
Increase collector area
Inspect and clean weep holes
and vents at bottom.
Clean as required
Repair
Check orientation. Face
collector within 45° of due
South
Remove obstacle and shading
or relocate collectors
Check tilt for geographic area.
Ensure tilt is equal to latitude
plus 15°
Compare with system
schematic and correct.
Check sensor placement
and insulation from ambient
conditions
Sensor line break. Check the
line and repair or replace
Short circuit. Check the line
for breaks, metal contact,
water exposure and corrosion.
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