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PROBLEM CHECK THIS POSSIBLE CAUSE CORRECTIVE ACTION
Pump does not start Electrical power supply Controller plug disconnected Reconnect control plug to
power outlet
Blown fuse or breaker tripped
on overload
Determine cause and replace
fuse or reset breaker
Pump Motor failure Replace pump
Sensors Defective sensors, sensor
error
Check wiring continuity.
Repair or replace
Pump starts, but cycles
continuously
Differential controller On and/or off temperature
differential set points too low
Reset on and off
differentials according to
recommendations
Piping Reversed connections to
collectors
Compare with system
schematic and reconnect
properly
Sensors Improper location Compare with system
schematic and reconnect
properly
Pump cycles after dark Differential controller Recooling function active
and max temperature setting
exceeded
Controller operating properly.
No fault.
Sensors Defective sensors, sensor
error
Check wiring continuity.
Repair or replace
Pump runs continuously Differential controller Off temperature differential set
too low
Reset off differential according
to recommendation
Controller set to “on” position Set system operation to
“Auto”
Pump operated but no fl uid
fl ows from collectors
Airstop System air-locked Purge air from airstop in solar
pump station by opening valve
slowly. Caution: after air is
evacuated fl uid will fl ow out
in a small stream and may be
hot. Cover port with a rag to
catch any fl uid.
Air vent System air-locked Open air vent on the top of the
system and purge excess air.
Close after purging.
Fluid Loss of fl uid from system Locate leak and repair
Isolation valves Valves in closed position Open valves
Piping Clogged or damaged piping Unblock piping or repair
damaged piping
Pump Broken impeller shaft Replace shaft
Not vented properly Install in correct orientation
Undersized System piping run too long.
Refer to maximum piping
lengths and adjust
Noisy system Air vents Air trapped in system Open automatic air vent and
purge airstop in solar pump
station by opening the valve
slowly. Caution: after air is
evacuated fl uid will fl ow out
in a small stream and may be
hot. Cover port with a rag to
catch any fl uid.
Pump Bearings are dry or have
excessive wear
Lubricate or replace
Impeller loose Tighten or replace impeller