12. Troubleshooting
Apart from those inspection items specifically outlined as “HOMEOWNER”, any
maintenance or repair must only be completed by Authorized Persons. The solar collector
warranty may be void if non-Authorized Person attempt to maintain or repair the solar
collector or associated system components. The solar system operates at high pressure
and high temperature and can result in damage to both property and personal injury if not
correctly operated and maintained.
CL = Specific to Closed Loop DF = Specific to Direct Flow
Pump not ON during
good solar radiation
conditions
Temperature sensors not working
properly
• Check that sensor is installed correctly
• Check that sensor wire is not damaged
• Check sensor Ohm reading with Ohm to °F chart in
controller manual
Pump not ON during
good solar radiation
conditions
Controller settings incorrect
• Check controller is set to AUTO operation
• Check maximum tank and collector settings
Pump not ON during
good solar radiation
conditions
Controller Max Temp setting has
been reached
• Check maximum tank and collector settings
Pump cycling ON and
OFF during good solar
conditions
Partial shading of collector
• Check collector location for shading
Pump cycling ON and
OFF during good solar
conditions
Excessive system flow rate
• Adjust restrictor screw on flow meter
• Reduce pump speed (select slower speed)
Pump cycling ON and
OFF during good solar
conditions
Controller settings incorrect
• Check if differential (dT function) is correct, dTMin may
be set too high, reduce to 2
°
C / 4
°
F
Pump always ON even
during minimal solar
radiation conditions
• Check flow gauge for proper flow rate
• Adjust restrictor screw on flow meter
• Check that all isolation valves are open
Pump always ON even
during minimal solar
radiation conditions
Air lock in piping system
• (DF/CL) Release air from air vent on highest point
• (CL) Purge system of air by following Fill and
Pressurize procedure described in section 7.9.
Pump always ON even
during minimal solar
radiation conditions
• T2 sensor (bottom tank) should be slightly above the
level of the solar flow port. If below the flow port, the
pump may run continually even when there is no solar
heat.
Pump always ON even
during minimal solar
radiation conditions
Controller settings incorrect
• dTMin may be set too low. Increase 2-3
°
especially if
closed loop system.
Controller settings incorrect
• (DF) Check that freeze protection setting is correct.
Intermittent circulation is freezing conditions is normal.
Ensure pipes are well insulated.
• (DF) Tank S2 sensor not getting accurate reading
Fluid dumping from
pressure relief valve on
pump station
Faulty pressure relief valve
• Replace pressure relief valve
Fluid dumping from
pressure relief valve on
pump station
• (CL) Replace expansion tank on pump station
Fluid dumping from
pressure relief valve on
tank
Excessive tank temperature
• Check Maxtemp Tank1 setting of controller
• Check tank sensor (T2) operation
Fluid dumping from
pressure relief valve on
tank
• Replace expansion tank on potable water side
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