Solar Thermal Troubleshooting

 

Use our troubleshooting guide to help solve common solar thermal problems.

If you are not confident in taking care of any issues yourself, contact AES Solar to help you. *This troubleshooting information is a basic guide only.

  • No power supply
    – Check wiring between supply and controller
  • Fuse Blown
    – Replace Fuse
  • Thermal cut-out activated
    – Reset
  • Sensor lead connections are loose
    – Check connection on sensors
  • Sensor faulty
    – Replace sensor
  • Collector sensor at maximum
    – No action necessary
  • Pump wiring faulty
    – Check wiring between controller and pump
  • Pump rotor damaged
    – See pump manufacturer’s instructions
  • Collector temperature and ΔT not satisfied
    – No action required
  • Minimum collector temperature activated
    – Deactivate function/no action required
  • Maximum collector temp met
    – No action necessary
  • Collector temp. below frost protection temp
    – Deactivate function
  • Loose connection or faulty collector sensor
    – Check connections and sensor wires
  • Collector cooling/holiday function activated
    – No action required/deactivate function
  • Temperature difference too small
    – Change ΔT’on’ and ΔT’off’ accordingly
  • Tube collector function activated
    – Deactivate function
  • Temp. sensor not fully inserted in place
    – Fully insert, secure and insulate
  • Pump wiring faulty
    – Check wiring between controller and pump
  • Pump rotor damaged
    – See pump manufacturer’s instructions
  • Pump Isolating valves are closed
    – Open valves
  • Auto air-vent closed
    – Open auto air-vent and check it over
  • Air lock at pressure relief valve
    – Vent the air
  • Air lock in system
    – Check all return pipework rises, check it falls on flow side, clear manual vents
  • Non-return valve jammed
    – Free the valve or replace if required
  • System in stagnation
    – Wait for systems to reach normal operating conditions
  • Leak in system
    – Check all joints
  • Drain/filling valve not closed
    – Fully close the valve
  • Auto air-vent is passing water
    – Clean or replace if necessary
  • Faulty pressure relief valve
    – Replace
  • Damaged expansion vessel
    – Replace
  • Pump wiring faulty
    – Check wiring between controller and pump
  • Pump rotor damaged
    – See pump manufacturer’s instructions
  • Prolonged period of low hot water use
    – Divert heat to a heat sink for storage
  • Air in system
    – Vent the system
  • Leak in collector
    – Contact AES for engineer options
  • Damaged insulation
    – Replace damaged parts
  • Limescale build-up
    – Drain and clean the system thoroughly
  • Dirty/Grime build-up on glazing
    – Use soft cloth, clean with solution of mild soap or household detergent and lukewarm water
  • Temp. sensor not fully inserted in place
    – Fully insert, secure and insulate
  • Storage cylinder temperature too high
    – Set lower storage tank and temp. limit
  • Temp control on boiler or heating programmer is set too low
    – Set temp. accordingly 60°C
  • Insufficient store insulation
    – Increase store insulation
  • Non-return valve faulty
    – Check and if necessary replace

Our team of 'sungineers' are waiting to help you

Phone:  +44 (0) 1309 676 911    Email: info@aessolar.co.uk

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