Identify the PremierPlus before looking for a reset
The name Santon PremierPlus covers a family of unvented hot-water cylinders, not a single boiler with one universal error-code display. A timer, boiler or controller nearby may show numbers, but those numbers belong to that device. Photograph the cylinder label and the device displaying any code so a repair company knows which equipment is reporting the problem.
The manufacturer's literature library lists Santon PremierPlus, Solar and SystemFit documentation alongside later PremierPlus literature. Check the title and model coverage inside a downloaded document, not just its link label. An archived link reviewed for this guide opened a SystemFit manual, so matching the actual document is important.
Find the model, capacity and serial number from a label you can read without moving the cylinder or removing covers. Include photographs of the wider installation taken from a safe position. If the label is inaccessible, tell the booking team instead of dismantling pipe insulation, electrical covers or cupboard fittings to reach it.
Do not apply a modern manual's spare-part list or a neighbour's reset procedure to an older unit solely because both say PremierPlus. The useful first task is identifying what you own and how it is heated. That can prevent an electrical appointment being booked for a water-flow problem, or a boiler visit for an electrically heated cylinder.
Describe which kind of “no hot water” you have
There are at least three different complaints hidden in that phrase. Water may flow normally from a hot tap but remain cold; very little water may emerge at all; or the water may begin hot and become cold sooner than expected. Record which happens at more than one outlet where it is safe to do so.
| What you notice | Useful booking detail | First investigation area |
|---|
| Normal flow, cold water | Whether the cylinder was scheduled to heat and which heat source is used | Heating supply, controls and heat transfer |
| No or weak hot flow throughout | Whether cold outlets also have reduced flow | Water supply and hot-water distribution |
| Only one shower is cold | Whether nearby hot taps behave normally | The affected outlet and its mixing arrangement |
| Hot water runs out quickly | Usage since the last heating period and whether this is a change | Stored quantity, heating period and outlet demand |
| Water visible at the tundish | Whether intermittent or continuous, observed without touching | Unvented-cylinder safety and control assessment |
| Water on the cupboard floor | Where first noticed and whether electrical equipment is affected | Safe leak assessment and source identification |
These categories organise a visit; they do not identify a failed part. A cylinder can have more than one problem, and a mixed symptom should be reported in full. For example, intermittent discharge and a shorter hot-water supply should not be reduced to a request for a new immersion heater.
Direct, indirect, SystemFit and Solar are not interchangeable
For a directly heated cylinder, the normal heat source is electrical immersion heating. An indirectly heated arrangement receives heat through a coil from a separate source such as a boiler, and may also have an immersion heater. Describe how your installation normally runs rather than assuming that every switch in the cupboard serves the same purpose.
The Santon PremierPlus SystemFit manual describes a pre-plumbed, wired indirect package with associated pump and controls. That is different from a plain cylinder supplied with separately installed system components. Its instructions should be matched to a SystemFit installation, not treated as a diagram of every PremierPlus cupboard.
A Solar variant introduces another heat-source arrangement and associated controls. The presence of solar equipment does not prove that all hot-water heating should happen from solar input at every time of year. Keep the solar controller's details separate from the boiler or immersion timer when reporting a problem.
If you are uncertain which arrangement you have, give the engineer the labels and normal routine: whether hot water is heated overnight, by a boiler programme, by a boost button or by more than one method. They can identify the system. You should not need to trace pipes by touch or operate unfamiliar valves to answer a booking question.
Cold water flows normally from all hot taps
Check the visible user controls without removing any covers. Is the expected hot-water period enabled? Did the clock change after a power interruption? Is a holiday setting active? Photograph the settings before changing them, and use the controller's own operating instructions if a routine user adjustment is needed.
For an electric arrangement, distinguish the scheduled heating control from a boost control where both exist. Record which normally provides the household's hot water and when it last worked. Do not assume that an illuminated switch proves an element is heating, or that a controller showing a demand proves electrical power is reaching the heater.
For an indirect installation, note whether the boiler displays its own fault and whether space heating is working. Heating working does not automatically establish that the hot-water demand is reaching the right controls. Give the engineer the observations and let them assess the control sequence and heat transfer.
The PremierPlus installation and user manual 7032982 issue 08 separates cold-water-at-hot-tap faults from loss of flow. It is a later reference document, so its instructions and parts must be checked against your unit. Electrical testing and concealed thermal-control work belong to a suitably qualified person.
Do not open a thermostat cover to press a reset button found in an online video. A protective cut-out needs its cause investigated, and a manual's servicing section is not automatically a homeowner procedure. Report repeated loss of heat after earlier resets so the technician can address the history rather than merely restore operation briefly.
The boost works but the usual heating period does not
This pattern is useful because it describes different operating conditions. Write down the schedule, when hot water is available and which user control changes that result. If you recently changed electricity tariff, meter or timer settings, include the date, but do not assume that change is the only possible explanation.
A limited amount of hot water after a boost does not necessarily demonstrate that the full store has completed its usual heating cycle. Compare like-for-like mornings with similar usage, rather than a quiet weekday against a day with several consecutive showers. The engineer needs the actual pattern to decide what to check.
Ask who should investigate the control and supply arrangement. A cylinder specialist and an electrician may need to coordinate depending on the installation. Do not bridge terminals, bypass a timer or leave an unfamiliar control permanently overridden to imitate a successful test.
Keep any evidence of electrical tripping, heat damage or a burning smell separate from an ordinary timer complaint. Stop using the affected equipment and arrange urgent qualified assessment where those signs occur. Repeatedly restoring a tripped supply is not a substitute for finding why it trips.
There is little or no flow from the hot taps
State whether all hot outlets are affected or only one. Compare with normal cold-water use if safe, and note any known supply interruption or plumbing work. The aim is to identify the extent of the symptom, not to dismantle a valve or clean an inlet strainer yourself.
A strong flow of cold water from a hot tap suggests a different problem from a hot tap producing almost nothing. Increasing a heating period will not resolve an actual flow restriction. Tell the booking team the distinction so they can prepare for the right assessment.
If just one mixer shower is affected while other hot outlets work normally, report that before a whole-cylinder replacement is discussed. An outlet-specific fault needs considering. Do not adjust concealed mixing controls or defeat anti-scald arrangements to obtain a hotter result.
After recent water-supply work, give the engineer the scope and date, including any stop valves that were operated by the contractor. A photograph of the installation before the work can help if you have one. Do not force stiff valves or turn several unidentified handles in the hope that one restores flow.
Hot water runs out sooner than it used to
Record the household's use since the last full heating period. A long shower, a bath and another shower close together create a different demand from a single basin wash. Note any recently installed high-flow outlet or change in occupancy. These details help distinguish a changed demand from a change in the system's heating performance.
Keep the cylinder capacity separate from the amount of useful mixed water at an outlet. They are not interchangeable figures, and a capacity label alone cannot predict the duration of every shower. Avoid buying a larger cylinder before an engineer has assessed whether the existing store is heating as intended.
Compare the same routine over a few ordinary uses if the system is otherwise safe. Note when water was last heated, when the first draw-off happened and when the temperature noticeably changed. Do not deliberately use scalding water or increase stored temperature as an experiment to extend the supply.
Ask the engineer whether the apparent reduction is a heating, control, distribution or usage issue. A useful explanation should connect findings to the shorter supply. Replacing an element because it is available quickly is not the same as demonstrating that it caused the problem.
Water discharging through the tundish
The tundish is the visible break in the safety discharge arrangement. Water there should be reported accurately, including whether it appears during heating, intermittently at other times or continuously. Observe from a safe distance. Do not touch discharge water, which may be very hot, and do not obstruct the outlet to stop the drip.
The PremierPlus issue 08 manual treats expansion-valve discharge and temperature/pressure-relief discharge as distinct faults. For suspected overheating or hot safety discharge, switch off heat sources using safe normal controls and obtain urgent specialist advice; do not shut the water supply as a way to stop that discharge. Do not attempt valve repairs or expansion-vessel recharging yourself.
A short safe video can help show the timing and rate, but do not delay an urgent call to obtain it. Tell the specialist whether the boiler, immersion or solar input was operating. If several discharge pipes join before the visible point, the water seen there may not identify the originating valve without inspection.
Do not copy a Megaflo internal-air-gap procedure onto a PremierPlus arrangement. Different cylinder designs manage expansion differently. The correct maintenance procedure depends on the identified product and installed components, and should be carried out by someone competent in unvented hot-water systems.
Water around the cylinder is a separate leak question
A puddle near the base does not prove that the cylinder vessel has failed. Water may have travelled from a nearby connection, another pipe or a discharge problem. Record where it first appeared and whether there is visible water tracking from above, without moving the cylinder or reaching around hot equipment.
Where water is near electrical equipment, avoid touching wet switches, covers or cables. Keep people away and arrange appropriate urgent help. An engineer should make the area safe before detailed diagnosis. Do not continue heating an installation that may have been drained or has an uncertain water supply.
Ask the contractor to distinguish a vessel leak from a connection leak and from safety discharge. The remedy, parts and access may differ substantially. Photographs of the source once safely identified are more useful than an invoice stating only “cylinder leaking”.
In a flat, notify the managing agent or landlord promptly if water could affect another property. Keep records of the report and agreed access. A replacement cylinder can be a significant intervention; ownership, approval and practical access should be established before it is ordered.
Prepare a useful service and parts record
Gather the model label, commissioning paperwork, previous service records and any invoices for controls or immersion replacements. Include the date the present symptom began and any changes immediately before it. The absence of paperwork is not a reason to invent a service history; tell the attending technician what is known.
Request a diagnosis and model-matched parts recommendation before ordering an item from a search result. A part advertised as fitting PremierPlus may relate to a particular generation or arrangement. The technician or supplier should confirm compatibility from the actual unit rather than its approximate age or exterior appearance.
Ask whether the visit covers the cylinder's unvented safety components as well as the immediate no-hot-water symptom. A boiler service does not necessarily document a cylinder service. Keep the work scopes distinct and retain the completed service record so future engineers can see what was actually checked.
After a repair, ask the engineer to demonstrate the normal user controls and explain what symptoms require a return call. Record the agreed heating schedule and any recommended follow-up. A household should not be left relying on an undocumented override that only the person who attended understands.
Book the trade that matches the fault
For heater, thermostat, safety-control or discharge faults, arrange a suitably qualified unvented-cylinder specialist, with electrical or boiler expertise as the installation requires. Send the exact PremierPlus model and symptom category when booking. This guide does not treat every cold-water complaint as a hidden leak.
If the evidence points to escaping water from connected pipework or damage around the installation, send Leak Fix London the findings and photographs. We can discuss appropriate water-leak investigation and repair, including access and reinstatement where needed. Tell us about any safety discharge so the correct specialist response takes priority.
Our leak work is £150 per hour. If we do not find the leak, you do not pay for time spent looking; see the pricing and service scope. That commitment does not cover a general electrical or cylinder-control diagnosis. Clear symptom information helps avoid paying for a service that does not address the fault.
