Kwikot heat pump error codes
This page lists the fault codes that Kwikot prints in its own manuals, in our own wording. Codes 00E to 15E come from the GT-SKR030P commercial manual. Ht and Lt come from a separate domestic manual that names no model. It is for owners who see a code such as 14E or 15E and want to know what Kwikot says it means before they call someone.
Safety first. Refrigerant work, gas work, mains wiring and water-heating repairs are for qualified technicians only. That means a refrigeration or HVAC technician for the refrigerant circuit, a registered electrician for wiring and a registered plumber for valves and pipes. Do not open the unit’s panels. Switch the unit off at the isolator before you go near it. Kwikot says owners should not repair the unit themselves, and that DIY installation can void the warranty.
Which Kwikot units this covers
The codes below come from two Kwikot manuals, and they are not equally specific.
- Commercial Series manual, model GT-SKR030P. This is the only manual that names a model. It lists 00E to 15E, and the table below follows it.
- Domestic Series manual (Kwikot product hp-003). This one names no model number in the text we could read. We use it only for Ht and Lt, and for a few notes. Because it names no model, you must check your own unit’s label and manual before assuming it applies.
We have not covered the Haier-badged integrated Kwikot units, because we could not read their manual. If yours is one of those, use its own manual.
Kwikot heat pump error codes, 00E to 15E, Ht and Lt
These are Kwikot’s meanings, shortened and reworded. Always confirm against the manual for your exact model.
| Code | What Kwikot says | Notes |
|---|---|---|
00E | Open-phase or reversed-phase protection on the three-phase supply. | A supply wiring matter. Electrician only. |
01E | Hydraulic pressure switch protection: a failed switch or low water flow. | Also listed in the domestic manual as a recoverable fault. |
02E | Current protection. | Needs a qualified technician to trace. |
03E | High pressure switch 1 fault. | Refrigerant-side protection. Technician only. |
04E | Low pressure switch 1 fault, which includes low refrigerant. | Kwikot ties this to leak-finding and recharging. Technician only. |
05E | Outlet water overheating: a blocked water line or an outlet sensor fault. | Plumbing and sensor checks are for a technician. |
06E | Water level switch fault. | None |
07E | High pressure switch 2 fault. | Same family as 03E, second switch. |
08E | Low pressure switch 2 fault. | Same family as 04E, second switch. |
09E | Communication error between the control panel and the main circuit board (PCB). | Both manuals list it. |
10E | Coil sensor 2 fault (open or short circuit). | A temperature sensor fault. |
11E | Coil sensor 1 fault. | The domestic manual calls it simply a coil sensor fault. |
12E | Environment (ambient air) sensor fault. | A temperature sensor fault. |
13E | Water outlet sensor fault. | A temperature sensor fault. |
14E | Water return sensor fault (open or short circuit). | This is Kwikot’s return sensor code. |
15E | Water-tank sensor 1 fault. | This is Kwikot’s tank sensor code. The domestic manual lists a water-tank sensor fault under 15E too. |
Ht | Overheat protection. The unit stops when the air is hot and the combined air and tank temperature gets very high. | From the domestic manual only. It restarts by itself when temperatures fall. No alarm sounds. |
Lt | Anti-freezing protection. In cold air the circulation pump runs to keep the water from freezing. | From the domestic manual only. It clears by itself. No alarm sounds. |
Kwikot describes 10E, 14E and 15E as open or short circuit sensor faults. For how these faults look in general, see our guide to temperature sensor faults. Replacing a sensor, a pressure switch or a circuit board is technician work.
What an owner can check
These basic checks are our suggestion. None of them involves opening a panel.
- Read and write down the code shown, and the model on the label.
- Check that the breaker and the earth-leakage switch have not tripped.
- Check the temperature setting. Kwikot recommends 55 to 60 °C.
- Clear leaves and debris from around the outdoor unit so air can move freely.
- Check that water is reaching the unit (our suggestion).
- If the evaporator is iced up, call a technician.
If the code is showing, log a service call with a Kwikot authorised agent.
The same fault has different codes on different brands
There is no universal heat pump code list. Each maker uses its own format and its own meanings, and the same fault shows up under different labels.
- Kwikot GT-SKR: codes like 14E (return sensor) and 15E (tank sensor).
- Nibe: numbered alarms. Alarms 2 and 3 are the heating medium return sensors, and alarms 6 and 7 are hot water sensors.
- Glow-worm GeniaAir: codes with an F. prefix, where F.519 is a return line sensor fault.
- Bosch: letter and number codes, where A7 is an outlet hot-water sensor problem on certain gas tankless water heaters only.
Aggregator sites sometimes contradict the makers’ own tables, so a code copied from a random page can send you the wrong way.
A7 and D1 do not appear in the Kwikot manuals we could read
People often search for “A7” or “D1” alongside Kwikot. We could not find a Kwikot meaning for either, and neither appears in the two Kwikot manuals above. The only official A7 we found is the Bosch gas tankless code. We found no official heat pump document that uses A7 for it. We found no manufacturer document that gives D1 as a return sensor error. If your unit shows A7 or D1, it may be a different brand’s controller. Check the label for the maker and model, and use that maker’s manual. On a Kwikot GT-SKR030P, the tank and return sensor faults are 15E and 14E.
Beyond the fix
Tips and tricks
- Switch power off before any maintenance and wipe outer parts with a damp cloth and household cleaner, not solvents.manufacturer manual
- Keep the area around the unit dry and ventilated. The manual lists dirty evaporator fins as a cause of a low-pressure fault.manufacturer manual
- For a hydraulic pressure switch code, the manual (for the GT-SKR commercial series) lists a dirty Y strainer and poor water flow. It lists cleaning the strainer and increasing water flow.manufacturer manual
Common mistakes
- Applying a code from one brand's manual to another brand's unit.
- Using chemicals on the casing.
Easily confused with
- 14E is the water return sensor and 15E is a water tank sensor in Kwikot's table, both open or short circuit.
Further reading
Questions
What does A7 mean on a Kwikot heat pump?
We could not find any Kwikot document that defines A7. The only official A7 we found is a Bosch code for the outlet hot-water sensor on certain Bosch gas tankless water heaters, which are not heat pumps. If your display shows A7, read the brand and model on the unit label and use that maker’s manual.
What does D1 mean on a Kwikot heat pump?
We could not find a Kwikot meaning for D1 either. One aggregator page we found describing a D1 was an aggregator site about a Goodman heat pump, and we could not confirm it against a Goodman document. Do not treat D1 as a Kwikot code without a manual that says so.
Which code is the tank sensor or return sensor on a Kwikot?
In the GT-SKR030P manual, 15E is a water-tank sensor 1 fault and 14E is a water return sensor fault. Both describe an open or short circuit. A fault in the sensor, its plug or its wiring is a job for a qualified technician.
Can I fix a Kwikot heat pump error code myself?
Only the simple checks listed on this page. Kwikot’s manuals say installation, wiring, start-up and repair are for qualified people, and Kwikot says warranty repairs are done only by it or its authorised agents. Note the code and call a service agent.
Sources
Kwikot: Commercial Series manual, GT-SKR030P; Domestic Series instruction manual (hp-003); Heat Pump Geyser Guide; consumer FAQs. Other brands: Nibe alarm overview; Glow-worm heat pump fault codes; Bosch bulletin TWH-G2-31. CodeFix is independent and not affiliated with Kwikot, Haier, Nibe, Glow-worm or Bosch. Heat pumps involve mains power, pressurised hot water and refrigerant, so leave repairs to qualified technicians.