State Standard Systems - Manual (Page 32)

32
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No hot water Storage water heater No power to auxiliary back-up
heating element
Check high temperature
protection and push reset
button on the heater
thermostat. (Use caution when
dealing with electricity.)
Storage water heater
thermostat
Thermostat defective Replace
Thermostatic mixing valve Improper adjustment Check water temperature at
house faucet and adjust valve
setting
Valve defective Replace. System must not
be run without thermostatic
mixing valve due to scald risk.
Not enough hot water Storage water heater Undersized for hot water
demand load
Replace
Thermostat set too low Increase set point temperature
Element failure Replace element
Thermostat failure Replace thermostat
Element disconnected Reconnect element and set
thermostat to 120°F
Check valve Heat loss due to defective
check valve in solar pump
station
Inspect valve and repair or
replace
Cold water supply dip tube Missing or defective Replace dip tube
Collectors Absorber coating degradation Replace collector
Collector panel area
undersized
Increase collector area
Excessive condensation Inspect and clean weep holes
and vents at bottom.
Glazing dirty Clean as required
Leaks Repair
Orientation Check orientation. Face
collector within 45° of due
South
Shaded by tree(s) or other
obstructions
Remove obstacle and shading
or relocate collectors
Improper tilt Check tilt for geographic area.
Ensure tilt is equal to latitude
plus 15°
Improperly plumbed Compare with system
schematic and correct.
Differential Controller Improper operation (cycling,
late turn on)
Check sensor placement
and insulation from ambient
conditions
Faulty sensor
is shown and control
reads 888.8 instead of
temperature
Sensor line break. Check the
line and repair or replace
Faulty sensor
is shown and control
reads -88.8 instead of
temperature
Short circuit. Check the line
for breaks, metal contact,
water exposure and corrosion.