Redring Display behaves erraticallywhat to check
Redring’s own heading for a Selectronic display doing odd things. Their fix is a power cycle at the isolator, and their aside is that the isolator should be off between showers anyway.
Take care
What this means
This is a line from Redring’s Self Help table, and it is a broad one on purpose. Display behaves erratically covers a digit that flickers or shows segments that make no letter, buttons that bleep but do nothing, a temperature that jumps, a lock light that comes and goes, and a shower that starts on its own or refuses to. The remedy Redring give is the same for all of it: switch off the electricity at the ceiling or wall isolating switch, wait a few seconds, switch on again.
Then comes a note that surprises people: the shower should be switched off each time after use at the ceiling or wall isolating switch. That is unusual advice for an electric shower and it tells you something about the appliance. The Selectronic is a microprocessor-controlled shower whose front panel talks to the logic board through a flying lead that plugs into the cover, and the board sits powered whenever the isolator is on. A mains glitch, a nearby storm, or simply months without a restart can leave it in a state where the display and the buttons stop agreeing, and a hard power cycle is the reset.
When the power cycle does not hold, the causes narrow. The flying lead from the cover is the first suspect, because the whole display depends on it and Redring warn about straining it every time the cover comes off. After that come water in the front cover, a Receiving PCB or Main Logic Board fault, or on the Premier the display board itself, all of which are in Redring’s spares list and all of which are behind the cover. One display that is not erratic and gets reported as such is the Premier’s scrolling pattern after Stop: the digits chase round while the shower cools and it then switches itself off, and that is normal.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Control electronics need a power cycle | Redring’s first and only owner remedy. A board that has been live for months, or has taken a mains glitch, can leave the display and buttons out of step until it is restarted. | Common |
| Flying lead between the cover and the board disturbed | Every function on the front runs through one plug-in lead. Redring warn about tugging it whenever the cover is removed, and a half-seated plug gives exactly this. | Occasional |
| Moisture in the front cover or on the buttons | A wet enclosure with touch buttons. Water behind the fascia holds a button or bridges the display until it dries out. | Occasional |
| Logic board or display board fault | When the power cycle does not hold and the lead is sound, Redring’s checklists end at the PCB. Their spares list includes the main logic board and the receiving PCB. | Rare |
What to try yourself
Switch the shower off at the ceiling pull cord or wall isolator, wait a few seconds, and switch it back on. This is Redring’s published remedy and it clears most of these.
Check what you are seeing against the normal displays first: a flashing digit while heating up, a capital C if Cooler was held at switch-on, a lowercase t before the thirty-minute switch-off, and on the Premier a scrolling pattern while it cools after Stop. None of those is erratic.
Dry the front of the unit and leave the isolator off for an hour if the bathroom has been very steamy or the shower has been splashed directly. Moisture behind the fascia clears on its own.
Adopt Redring’s habit of switching off at the isolator after each shower. They give it as a note to this exact fault, and it means the board is only live while the shower is in use.
If the display keeps misbehaving after a power cycle, stop using the shower and book a repair. The flying lead and the boards behind the cover are the remaining causes and they are engineer work.
A shower whose controls you cannot trust is a shower you cannot reliably stop. Leave it isolated rather than showering with a display that ignores the buttons.
Get a qualified electrician to look at your Redring electric shower
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified electrician, tell them the make, the model and the exact code or message on the display, and ask whether they carry parts for this make — that is what turns one visit into a repair rather than a quote.
What it costs to fix
Typical repair cost
£0–£200
Time on site
10 minutes
Nothing for the power cycle. A flying lead reseated is a short visit; a logic board or receiving PCB is the expensive end and on an older Premier may be weighed against a new unit.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Own this appliance and had this code? . Nothing is published until a person has read it.
Related Redring fault codes
- tUsually simple to fixA lone t on a Selectronic Premier, with bleeps, is the thirty-minute auto switch-off warning in temperature-lock mode. Press Warmer or Cooler and it carries on.Related: controls
- Water too COLDGet it checkedRedring answer this with eight checks in a deliberate order, and the seventh is the one nobody guesses: run the shower cold to reset the cut-out.Related: same brand
- otGet it checkedOver Temperature Shutdown on a Selectronic: the water got too hot, so the shower stopped it. Purge it cold before restarting, and stop using the isolator to switch off.Related: same brand
- Shower cycles from HOT to COLDGet it checkedRedring name one cause: the temperature is set too high, so the thermal cut-out keeps operating. Their fix is a dial adjustment done slowly.Related: same brand
- Water too HOTGet it checkedRedring give six checks, and the one that distinguishes them is a filter inside the solenoid valve that other brands do not send you to.Related: same brand
- Water dripping from the bottom of the showerGet it checkedRedring attribute this to the safety pressure relief having operated, and they are clear it is a replacement part rather than something that reseals.Related: same brand
Own a Redring electric shower? Save it and its codes come first next time.
Related guides
Common questions
Should an electric shower really be switched off at the isolator every time?
On the Selectronic, Redring say so in their own troubleshooting table. It is not a general rule for every brand; it is their note for this appliance, and it costs nothing to follow.
The display shows a capital C. Is that erratic?
No. C is the Premier’s commissioning display, entered by holding the Cooler button at switch-on. Let the unit fill, press Start/Stop to stop it, and start again normally; the C is gone.
The digits chase round the display after I press Stop.
Normal on the Premier. Redring describe the display scrolling round while the water runs on to cool the unit, after which it switches off automatically.
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer technical and service documentation
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.