State Deluxe Systems User Manual
Page 33
33
PROBLEM
CHECK THIS
POSSIBLE CAUSE
CORRECTIVE ACTION
Not enough hot water (cont.)
Differential Controller
Improper wiring or loose
connections)
Compare with system
schematic. Check for proper
connections. Seal all splices
against moisture
Isolation valves
Closed
Open
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.
Piping
Insuffi cient Insulation
Add insulation where required
High heat losses
Check insulation for splits,
deterioration, absence
Nighttime thermosyphoning
Check for pump operation at
night
Improperly plumbed
Compare with system
schematic. Check fl ow
direction
Flow blockage
Flush system. Check effl uent
for debris.
Low system pressure
Check pressure gauge. Set
system pressure to correct
setting, check for leaks.
Pump
No power
Check breaker, pump cord,
and controller fuse. Repair or
replace
Flow rated too high or too low
Adjust fl ow rate
Faulty pump
Listen for irregular noises
in pump operation. Feel
collector feed and return line
for temperature difference.
Ensure all air is purged from
system.
Runs continuously
Check sensors for shorts
No hot water in the morning
Storage water heater
Circuit breaker shut off
Turn breaker on
Differential controller
Sensor wires reversed
Ensure the collector and
tanks sensors are wired to
the correct position on the
controller
Water too hot
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.
No water
Cold-water supply valve
Valve closed
Open valve
Pump does not start
Differential controller
Controller set to “off” position
Set system operation to
“Auto”
Unplugged
Return power to controller
On and/or off temperature
differential set points too high
Reset on and off
differentials according to
recommendations
Loose contacts
Clean contacts and tighten
connections or replace
Blown fuse
Replace fuse