Armstrong Rada 320D Manual de instalación y mantenimiento - Página 18
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Troubleshooting
Fault Diagnosis
Read the section "Important Safety Information" first.
If any maintenance is required then it must be carried out by a competent tradesperson. Before replacing any parts
make sure that the underlying cause of the malfunction has been resolved.
Warning! There are no user serviceable components beneath the casing of the appliance. Only a competent
tradesperson should remove the cover.
Symptoms
1. Only hot or cold water from
outlet.
2. No flow from Mixing Valve
outlet.
3. Mixed water temperature
at TMV outlet fluctuates
and does not respond to
adjustment.
4. Hot water in cold supply
and vice-versa.
Probable Cause
a. Inlet supplies reversed (i.e.: hot to cold
or vice-versa)
b. No hot water available from hot water
source.
c. Screen/filters occluded or inlet supply
fittings plugged.
d. Refer to Symptom 4 below.
e. Proportioning mechanism (Cartridge)
trapped against hot/cold seat.
a. Hot or Cold inlet supply failure;
Thermostat holding correct shutdown
function.
b. Screens/filters blocked or inlet supply
fittings plugged.
a. Thermostat not operating correctly.
b. Mixing Valve operating below minimum
required flow rate.
c. Static inlet supply pressures beyond
valves capability to correct.
d. Inlet supply pressures fluctuating
beyond valves capability to correct.
e. Hot water supply temperature
fluctuating beyond valves capability
to correct.
f. Partially occluded screens/filters or
partially blocked inlet fittings.
a. Indicates non-functioning check valve
(s).
Check-Rectify. Tip: Check rear of valve
under polymer mounting plate for
raised "H" (hot) on appropriate inlet. If
sight evaluation is not possible consult
factory Technical Support for additional
diagnositc tips.
Check-Rectify
Refer to Servicing/Maintenance - Rectify.
Refer to Symptom 4 below.
Refer to Servicing/Maintenance.
Check-Rectify.
Refer to Servicing/Maintenance - Rectify.
Replace Cartridge.
Check that at least 2 GPM is flowing
through valve.
Check-Rectify
Check-Rectify
Check by carefully sensing inlet hot
supply pipe work- rectify.
Refer to Servicing/Maintenance - Rectify.
Diagnose by turning off mixed water
outlet flow and check to see if inlet hot
pipe work becomes cold and vice-
versa.
18
Possible Remedy
(contd...)