Common Techcross BWTS Faults and Fixes
Updated
Techcross ECS and HYCHLOR faults cluster around electrode wear and scaling, low or unstable TRO, power and rectifier faults, dosing problems on HYCHLOR, and neutralisation issues on discharge. This article describes the common fault patterns, how to separate analyser problems from treatment problems, and the fixes, with independent diagnosis and parts support from Sea Clean AS, which is not a Techcross-authorized agent.
Key takeaways
- Interpret electrolysis voltage/current, TRO, flow and salinity together rather than reacting to a single alarm.
- A rising voltage trend for the same output signals electrode scaling or coating loss; cleaning helps scaling, not coating loss.
- Clear the TRO analyser (reagent, sample line, cell, sensor) before blaming the electrolysis unit for low TRO.
- Power and rectifier faults are distinct from electrode wear and need electrical diagnosis, not electrode replacement.
- On HYCHLOR, a dosing pump or injection fault under-treats ballast even when the generator reads healthy.
- Escalate D-2-affecting or PSC-risk faults early; urgent Norway/North Sea attendance is typically within 0-24h.
Reading Techcross Faults Methodically
Techcross alarms are most reliably interpreted by reading the live parameters together rather than reacting to one message. The electrolysis voltage and current, the TRO reading, the flow, salinity or conductivity, and the valve and dosing states each tell part of the story, and the combination usually identifies the cause.
As with any electrolysis BWTS, the key question is whether the problem is in measurement or in process. A starved or drifting TRO analyser, a blocked sample line or a sticking valve produces alarms that mimic a treatment failure; confirming the supporting instrumentation first avoids replacing electrodes or power parts needlessly.
Recording the water source, temperature, salinity and flow at the time of the alarm provides essential context, because low salinity and warm water materially change electrolysis behaviour. Sea Clean uses this information to advise remotely or to prepare parts before attending.
Electrode Wear and Scaling
The most common long-term Techcross issue is electrode degradation. As electrodes scale and lose coating, the unit needs higher voltage to reach the same oxidant output, TRO falls and power faults become more likely. A gradual upward trend in voltage for a given output is the classic indicator that electrode service is due.
Scaling, common in hard or warm water, can sometimes be reduced by inspection and cleaning, restoring some performance. Coating loss and physical erosion, by contrast, require electrode replacement; cleaning will not recover a worn coating. Distinguishing the two during inspection determines whether the fix is cleaning or replacement.
Sea Clean inspects electrolysis units, advises on cleaning versus replacement, sources matched electrodes and verifies output afterward. Because electrode performance depends on conductivity, marginal electrode condition often first shows up during low-salinity operation.
Low or Unstable TRO
Low TRO is one of the most consequential Techcross symptoms because it can mean under-treatment. Before suspecting the electrolysis unit, the analyser must be cleared: check that reagent is in date and correctly fitted, the sample line is clear and flowing, the measuring cell is clean and the sensor is in good condition.
If the analyser is healthy and TRO is genuinely low, the causes include electrode wear, insufficient power, low salinity or conductivity below the unit's effective range, or excessive flow for the conditions. Each is checked against the live parameters: salinity against the unit's minimum, flow against the rated range, and electrolysis voltage and current against expected values.
Sea Clean supplies in-date reagents and analyser consumables and, where the cause is in the electrolysis unit, sources electrodes and power components. Confirming whether low TRO is analyser or process is the single most useful diagnostic step.
Power, Rectifier and Electrical Faults
Electrolysis draws heavy current, so power-supply and rectifier faults are a recognised Techcross failure mode. They present as power trips, abnormal or erratic current, or the unit failing to energise, and they are distinct from electrode wear even though both can reduce treatment.
Diagnosis is electrical: checking the rectifier, contactors, connections and supply rather than assuming the electrodes are at fault. Replacing electrodes when the real problem is a rectifier wastes parts and leaves the vessel unfixed, so the electrical chain is verified before electrode work is considered.
Sea Clean diagnoses power and electrical faults during attendance and sources rectifier and power components for the installation. Clear separation of electrical from electrode faults is central to an efficient repair.
Dosing and Neutralisation Problems
On HYCHLOR, the side-stream dosing system can fault independently of the generator. A dosing pump, line or injection-point problem under-doses the main flow, so ballast is under-treated even though the electrolysis side reads healthy. The dosing pump output, line integrity and injection point are checked when treatment is low but the generator looks normal.
On discharge, both systems must neutralise residual oxidant above the permitted limit, usually with sodium thiosulfate. Neutralisation faults come from empty or low neutraliser stock, a dosing pump or line problem, or an incorrect command, and discharging above the limit is both a compliance and a safety issue that must be corrected before discharge continues.
Sea Clean sources dosing and neutralisation components and supplies sodium thiosulfate neutraliser, and during attendance verifies the dosing and discharge chain so the whole sequence is sound.
Crew Action, Escalation and Attendance
Some Techcross faults are crew-clearable with guidance, such as an expired reagent, a blocked sample line, low neutraliser stock or a reset after a transient trip. Others, including electrode replacement, power-supply faults, dosing-system repairs and anything affecting D-2 validity, warrant engineer attendance and sourced parts.
A fault that risks a port state control finding or a non-compliant discharge should be escalated early so contingency measures and documentation can be arranged before arrival. Sea Clean can advise whether a reported fault is a crew item or an attendance case based on the parameters provided.
From the Haugesund base, urgent Techcross attendance in Norway and the North Sea is typically within 0-24 hours subject to scheduling, and worldwide by mobilising as flights, visas and access allow. Send the model, alarm history, parameters and IMO number to post@seaclean.no to begin diagnosis.
Frequently asked questions
Why is TRO low on a Techcross system?
First rule out the analyser: expired reagent, a blocked sample line, a dirty cell or a worn sensor. If the analyser is healthy, genuine low TRO can come from electrode wear, insufficient power, salinity below the unit's effective range, or excessive flow for the conditions, each checked against the live parameters.
Can scaled electrodes be cleaned or must they be replaced?
Scaling, common in hard or warm water, can sometimes be reduced by inspection and cleaning, recovering some performance. Coating loss and physical erosion require replacement, because cleaning cannot restore a worn coating. Inspection determines which condition is present and therefore the fix.
How do power faults differ from electrode faults?
Power and rectifier faults present as power trips, erratic current or the unit failing to energise, and are diagnosed electrically by checking the rectifier, contactors, connections and supply. Electrode wear shows as a gradual rise in voltage for the same output. Treating one as the other wastes parts.
Is Sea Clean authorized by Techcross to service these systems?
No. Sea Clean provides independent service, troubleshooting and parts sourcing for Techcross and is an authorized agent for Headway only. We do not claim OEM authorization from Techcross. Where a matter genuinely requires the manufacturer, we are clear about that limit.