Technibel PHRIE Series - Page 114

114
5.2.3 SYMPTOMS & PARTS TO INSPECT
Hydraulic circuit defaults
alarm
display
LED W
on A2
Alarm
contents
Judgement conditions
clearing
condition
Judgement and correction
Slow
flashes
(1/sec)
Water flow default in heat
pump
No water flow detected by flow switch
Manual reset if default lasts more than
1 mn
or happens more than 3 times in a hour
Recovery
at restart
1.Check water circulating pump
operation
2. Check that circuit valves are
open
3. Check water circuit filter
4. Check water circuit pressure
5. Check flow switch (see §2.3.2)
Quick
flashes
(2/sec)
Low water temperature on
Heat Exchanger outlet
In defrost, temperature detected by TW2
sensor is below 16°C
In cooling mode, temperature detected
by TW2 sensor is below 4°C
Manual reset if default happens more
than 3 times in a hour
Recovery
at restart
1.Check water volume
of the circuit
(could be too low)
2.Check water flow in heat pump:
• Water flow adjustment on
circulating pump (see § 2.3.1)
• Position of valves on circuit
• Water circuit filter cleanliness
Flickering
Disconnection, open
circuit or short circuit
in water temperature
sensor TW2/S9
Open circuit or short circuit
Manual reset if default lasts more than
30 mn
Recovery
at restart
1. Check temperature sensor TW2
2. Check A2 board
Refer to diagnosis method (section
5.4)