| Problem |
Cause |
Action |
| An 'F'
reading on controller LCD display |
- Loose connections on sensor leads
- Faulty sensor
- Collector sensor at maximum
|
- Check sensor wires for connection
- Replace sensor
- No action required
|
| Pump
will not run |
- Mains/pump wiring faulty
- Pump rotor damaged
- The pump control selector P is in manual
'OFF' position
- TC incorrectly set
- TC and DT not satisfied
|
- Check wiring at mains/pump
- See pump manufacturers instructions
- Check SMT unit and return pump control P
to automatic mode 'AUT'
- Reset to 25°C
- No action required
|
| Pump
runs continuously |
- Collector temperature is below TF temperature
- Loose connection or faulty sensor on the
collector
- Collector temperature at maximum
|
- No action required TF flashes
- Check connections and sensor wires
- No action required
|
| No circulation
in system |
- Pump isolating valves closed
- Automatic air-vent closed
- Air lock at pressure relief valve
- Air lock in the system
- Non-return valve jammed
- Pump is not running
- System in stagnation
|
- Open valves
- Open aut. air-vent and check condition -
replace if necessary
- Twist cap at pressure relief valve and vent
air
- Check all pipework rises on return side,
falls on flow side - clear manual vents
- Free valve or replace
- See above
- Wait until system reaches normal operating
conditions
|
| Pressure
drops in system |
- Leak at manifold
- Leak in system
- Drain/filling valve not closed
- Aut. air-vent passing water
- Faulty pressure relief valve
- Damaged expansion vessel causes pressure
fluctuation and relief valve to open
|
- Check collars on all tubes for leaks tighten
if necessary
- Check all joints
- Close fully
- Clean or replace if necessary
- Replace
- Replace
|
| Overheating |
- Pump does not run
- Prolonged period of low hot water consumption
|
- See above
- Divert heat to heat sink
|
| Performance
loss |
- Broken tubes
- Damaged insulation
- Build up of lime stone around heat exchanger
tube condenser
|
- Replace broken tubes (because of diode function
of tube replacement does not have to be done
immedi-ately)
- Replace damaged parts
- Drain and clean system thoroughly
|
