10.0 Troubleshooting
Once installed, this fan convector becomes an integral part of
the heating system that will also include boiler, pump, other
emitters such as radiators and fan convectors, and a number of
heating controls depending on system complexity. An apparent
problem with this unit may be the result of system controls being
incorrectly set, and can be solved easily without calling out your
installer or MYSON. Before calling out your installer or MYSON,
please carry out the checklist below.
Common Installation Faults
For optimum performance, this unit must be correctly sized to
match the heat loss requirements of the space it is required to
heat, and the heating system must be correctly designed to
provide adequate flow of hot water to the unit (see section 2). If
the recommendations in section 2 are not followed problems
may arise as detailed below.
Other Faults
Heating Mode -
No Fan
Possible Causes
Room thermostat not calling for heat
Unit not switched on at breaker panel
Breaker tripped at panel
Water temperature reaching unit
below 110°F
Problem
Remedy
Turn up room thermostat
Switch on breaker
Check all wiring, reset breaker
Check boiler -
Programmer ON
Boiler ON and set to high
Circulating pump running
Note:
Operation of fan convector can be checked by
switching to summer setting
Poor heating
performance
(unit may cycle on
low limit thermostat)
Possible Causes
Boiler thermostat set too low
Lack of flow to fan convector -
Pump set on low setting
Isolating valves not fully open
System incorrectly balanced with unit starved of hot water flow
Pipe sizing to unit too small
Problem
Poor heating
performance
Unit incorrectly sized for heat loss of room
If the fan convector is still faulty after checking the above, call your installer or MYSON.
Heating Mode
poor heating
performance and/or
unit cycles on
low limit thermostat
Low water temperature to unit
Turn up boiler thermostat
Poor water flow
Vent air from heating system
No flow through unit,
and fan not operating
Possible Causes
Solenoid valve not energised
Solenoid valve not opening
Problem
Remedy
Check room thermostat set correctly and
functioning
Check transformer output 24V
Check 24V actuator
10
WHISPA III
®
5000, 9000 & 12000 RCU
EN
33359 Whispa RCU (US) FR.qxp 15/04/2019 11:00 Page 11
