rada 320 - Troubleshooting; Common Issues and Solutions

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1300905-W2-A
1. Only hot or cold water from outlet
a. Inlet supplies reversed (i.e. hot supply to cold inlet). Check.
b. No hot water reaching mixing valve. Check.
c. Check lters and inlet ttings for blockage.
d. Installation conditions continuously outside operating parameters. refer to Specication.
2. Fluctuatingorreducedowrate
a. Check lters and inlet / outlet ttings for ow restriction (check isolators are fully open).
b. Ensure that minimum ow rate is sufcient for supply conditions.
c. Ensure that dynamic inlet pressures are nominally balanced.
d. Ensure that inlet temperature differentials are sufcient.
e. Check thermostatic performance; renew cartridge assembly if necessary.
3. Noowfrommixingvalveoutlet
a. Check inlet isolators are fully open.
b. Check lters and inlet / outlet ttings for blockage.
c. Hot or cold supply failure.
4. Blend temperature drift
a. Refer to sympton 2 above.
b. Hot supply temperature uctuation (rectify and refer to Commissioning).
c. Supply pressure uctuation (refer to Installation)
5. Hot water in cold supply or vice versa
Indicates check valve require maintenance, refer to Maintenance.
Note! Some 320 variants are not supplied with checkvalves. Therefore, in-line checkvalves
may require maintenance. These may be away from the product.
6. Maximum blend temperature setting too hot or too cool
a. Indicates incorrect temperature setting. Refer to Commissioning.
b. As sympton 4 above.
c. As sympton 5 above.
7. Water leaking from valve body
Seals worn or damaged.
a. Obtain Seal Pack and renew all seals.
b. If leak persists from around the temperature spindle, replace the cartridge assembly.
Troubleshooting