Rangemaster C1 fault codewhat it means and how to fix it
One of the C1 to C8 microprocessor alerts. Rangemaster’s published remedy is to switch off and on and carry on using the hob.
Before you start
What C1 means
Rangemaster publish C1 through to C8 as a single row in their table, described as a microprocessor alert, with one remedy covering all eight: switch off and on, continue to use the hob, and call a service agent only if the code returns. The fact that eight codes share one description tells you something useful about what they are. These are not eight distinct diagnoses that the company has declined to explain. They are positions in a self-check, and what they have in common is that the control detected an internal state it did not expect and stopped rather than carrying on. Which of the eight appears narrows things down for an engineer with the service documentation, and it does not narrow anything down for you — which is why the same advice covers all of them. That makes the reset genuinely worth doing rather than a delaying tactic. A control that has got itself into an unexpected state usually comes out of it on a proper power cycle, because the check runs again from a clean start.
Rangemaster publish that the hob runs a rapid self-test of the control unit when it is first switched on after connection, which is that same check. A single C code followed by normal service for months afterwards is a transient and needs nothing further. What matters is the pattern. A C code that returns is the control failing the same check repeatedly, and at that point the reset has stopped being informative and the appliance needs someone with the service documentation.
Rangemaster also publish a separate flash error, ER20, in their service table, described as the microcontroller being defective with the instruction to replace the control, which is where a persistent problem of this kind ends up. Worth noting how the company treat their genuine blanks, because it is honest and it helps you read the rest of the table. In the guides for their 110 cm range cookers with induction tops, the Toledo+ 110 and the Classic Professional+ 110, the only row for Er followed by a number is a general one: the appliance has developed an internal technical fault that cannot be rectified by the user, consult your installer or a qualified repair engineer. That is a published statement that there is nothing for you to do, rather than an omission.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| A transient internal state | The common case, and why a reset is the published remedy. The control found something unexpected during a self-check and stopped rather than continuing. | Common |
| A momentary supply disturbance | A dip or spike can leave the control in a state its self-check does not like. Rangemaster publish separate voltage codes, so this shows up as one or the other. | Occasional |
| A degrading control board | Where a repeating C code usually points. The check fails consistently because something on the board no longer behaves as the firmware expects. | Occasional |
| A firmware or memory fault | Rangemaster publish a separate flash error described as the microcontroller being defective, with the control to be replaced. That is the end point of a persistent fault. | Rare |
What to try yourself
Switch the hob off and on. This is Rangemaster’s published remedy for the whole C1 to C8 range, not a generic suggestion.
Use the isolator or the wall switch rather than just the touch control, so the electronics genuinely lose power and the self-check runs from a clean start.
Carry on using the hob normally. Rangemaster explicitly sanction continued use after a reset on these codes.
Write down which of the eight you saw and the date. The specific number means something to an engineer with the service documentation.
If it comes back, note whether it is the same number each time. A consistent one points at a consistent fault.
Call an authorised service agent on a recurrence, and give them the exact code and your guide number.
Get a qualified appliance engineer to look at your Rangemaster C1
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified appliance engineer, 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–£320
Time on site
20 minutes
Nothing for a one-off that resets and stays away, which is the expected outcome. A control board replacement if it recurs, which is the most expensive part of an induction hob after the power 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 Rangemaster fault codes
- EAGet it checkedAnother code Rangemaster publish two ways — a coil saturation error you can reset in one guide, a hardware fault in the other.Related: electronics and power
- E5Get it checkedRangemaster publish two meanings for E5 in two different guides — an over-temperature in one, a mains voltage error in the other. Check which guide covers your model.Related: same brand
- E3Get it checkedTwo tables, two meanings. On the Eclipse 90 it is the supply voltage outside the rated values; on the RMB60HPEIGL it is a pan problem, and Rangemaster publish the test that separates pan from hob.Related: same brand
- E1Get it checkedThe cooling fan is disabled. Rangemaster offer no reset for this one — the published action is to call a service agent.Related: same brand
- ECGet it checkedA supply voltage error. Reset it once, and if it comes back stop resetting — the hob is reporting something about the circuit feeding it.Related: same brand
Own a Rangemaster hob? Save it and its codes come first next time.
Related guides
Common questions about Rangemaster C1
Does it matter which of C1 to C8 I have?
It matters to an engineer with the service documentation and not to you, which is exactly why Rangemaster publish one description and one remedy for all eight. Write down which one you saw and pass it on — it narrows things down at the repair end even though it changes nothing about what you should do now.
Is it safe to keep using the hob?
After a reset, yes — Rangemaster’s own instruction is to switch off and on and continue to use it, escalating only if the code returns. They reserve the no-reset treatment for codes like the cooling fan one, where they offer no reset at all and send you straight to a service agent.
Why does a reset fix it?
Because the control runs a self-check on power-up and the reset makes it run again from a clean start. Rangemaster publish that a rapid self-test of the control unit is carried out when the hob is first switched on after connection. A transient state clears; a real fault fails the check again.
What about codes that are not in the list?
In the Toledo+ 110 and Classic Professional+ 110 range cooker guides Rangemaster publish one general row for Er followed by a number: the appliance has developed an internal technical fault that cannot be rectified by the user, consult your installer or a qualified repair engineer. It reads like a non-answer but it is a real one — the company are saying there is no owner action, rather than simply having left the code out of the table. The Eclipse 90 and RMB60HPEIGL guides have no such catch-all row.
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.