Compliance & Safety · August 28, 2026
Monsoon and Your Lift: What to Check Before the Water Finds the Pit
By Yajvin Tandon · Director
Last updated August 28, 2026
Every monsoon, lifts fail for the same three reasons: water in the pit, damp in the controller, and a power supply that keeps collapsing. All three are predictable, and all three are cheaper to prevent than to repair.
In Short
Water in the pit is the expensive one — the standard requires the pit to be impervious to water infiltration, and a flooded pit reaches buffers, safety gear and switchgear.
Humidity kills controllers quietly — condensation in the machine room causes faults that look electrical and get misdiagnosed for months.
Monsoon is when the ARD earns its keep — power cuts multiply, and a rescue device with a tired battery is discovered at the worst possible moment.
Most monsoon failures are last monsoon's problem, unfixed — the water mark on the pit wall was there in June.
Three things break lifts during the monsoon in Delhi: water entering the pit, humidity in the machine room and controller, and an unstable power supply. Each has a defined engineering answer. The pit must be impervious to water infiltration and may need drainage; the machine room needs controlled humidity and ventilation; and the rescue device, emergency lighting and residual-current protection must actually work when the supply fails.
Why Does the Monsoon Break Lifts?
A lift is a machine that lives in a vertical hole in the ground, with its most sensitive electronics in a room that is often the hottest and least ventilated space in the building. The monsoon attacks both ends at once. Water finds the bottom of the shaft, and moisture finds the controller.
Nothing about this is unpredictable. Every failure described here happens on a schedule, in the same weeks, to the same buildings, and usually for the second or third consecutive year.
What Happens When Water Gets Into the Lift Pit?
The pit is the lowest point in the shaft, which makes it the destination for any water that enters the building envelope near it — groundwater rising, a leaking wall, a blocked drain, or wash water running under a landing door. IS 17900 is explicit: after guide rail fixings, buffers and grids are built in, the pit shall be impervious to the infiltration of water. The standard also allows for water drainage devices in the pit floor. Both of those requirements exist because the industry already knows where the water goes.
What sits in a pit is not incidental equipment. Buffers, safety-gear components, the governor tension arrangement, travelling cable, pit lighting, the pit stop switch and, in many installations, switchgear. Standing water reaches all of it. Steel corrodes where it is meant to compress and arrest. Electrical contacts corrode where they are meant to break a circuit reliably.
For fire lifts the standard is stricter, and it is worth knowing as a benchmark even if your lift is not one. Electrical switchgear placed less than one metre above the pit floor must be protected to IP 67, the socket outlet and lowest lamp must sit at least half a metre above the highest permissible water level, and means must be provided so water cannot rise above the level of the fully compressed car buffer. That last requirement describes exactly the failure the monsoon produces in ordinary buildings: water above the buffer, in a pit nobody has opened since last year.
How Do You Check the Pit Yourself?
Ask your maintenance agency to open the pit in your presence, before heavy rain, and look for four things.
- 1. A water line on the pit wall — a horizontal stain or rust mark shows the pit has flooded before and how high the water rose. This is the single most useful piece of evidence in the building.
2. Rust on buffers, safety gear or the pit ladder — corrosion at the bottom of the shaft is not cosmetic. These are arresting components.
3. Standing water, damp silt, or a blocked drainage point — if a drainage device exists, confirm it is clear and actually discharges somewhere.
4. The condition of the pit stop switch, lighting and socket— low-mounted electrical fittings are the first things water reaches.
If you find a water line above the buffer height, treat it as urgent rather than seasonal.
Can Humidity Really Damage a Lift Controller?
Yes, and it is the failure people misdiagnose for the longest. IS 17900 is direct about machine-room conditions: additional care should be taken with regard to humidity and air quality to avoid technical problems, for example condensation. It also notes that failure to maintain machine-room conditions can result in the lift automatically removing itself from service until conditions return to their intended range.
Condensation forms when warm, wet monsoon air meets equipment that is cooler than the air around it. It settles on boards, terminals and contactors. The result is not a dramatic failure. It is intermittent nonsense: a lift that trips on a fault nobody can reproduce, a door that misbehaves only in the mornings, a drive that reports an error and then clears it. Buildings replace parts, blame the last contractor, and repeat this until the weather changes and the symptom disappears on its own.
Ask three questions about your machine room. Is it ventilated, or is it a sealed hot box? Is there any sign of water ingress from the roof or the walls? And has the maintenance agency recorded intermittent faults with the dates on which they occurred, so a pattern can be seen at all? Fault records exist for precisely this. Without them, a seasonal problem is invisible.
Can Humidity Really Damage a Lift Controller?
Yes, and it is the failure people misdiagnose for the longest. IS 17900 is direct about machine-room conditions: additional care should be taken with regard to humidity and air quality to avoid technical problems, for example condensation. It also notes that failure to maintain machine-room conditions can result in the lift automatically removing itself from service until conditions return to their intended range.
Condensation forms when warm, wet monsoon air meets equipment that is cooler than the air around it. It settles on boards, terminals and contactors. The result is not a dramatic failure. It is intermittent nonsense: a lift that trips on a fault nobody can reproduce, a door that misbehaves only in the mornings, a drive that reports an error and then clears it. Buildings replace parts, blame the last contractor, and repeat this until the weather changes and the symptom disappears on its own.
Ask three questions about your machine room. Is it ventilated, or is it a sealed hot box? Is there any sign of water ingress from the roof or the walls? And has the maintenance agency recorded intermittent faults with the dates on which they occurred, so a pattern can be seen at all? Fault records exist for precisely this. Without them, a seasonal problem is invisible.
What Should Be Done Before the Next Heavy Rain?
Six checks, in the order that matters.
1. Open and inspect the pit — look for the water line, corrosion, standing water and blocked drainage. Photograph what you find and keep it with the lift's records.
2. Test the ARD under a real supply cut — not a simulated signal. Confirm the car reaches a landing and the doors open, and ask when the battery was last replaced.
3. Test the emergency lighting and the alarm — for the full duration, not for the ten seconds it takes to see the lamp illuminate. Confirm the alarm reaches somebody who will answer at night.
4. Check the machine room for ventilation and leaks — roof seepage, wall damp, blocked vents. Condensation on equipment is a finding, not a curiosity.
5. Verify residual-current protection is present and functional — and that it has been tested, not merely installed.
6. Ask for the fault log for the last twelve months — if the same faults appear in the same weeks each year, you have a seasonal defect being treated as bad luck.
Five of those six cost nothing but the discipline to ask and the willingness to look.
Does Any of This Affect Compliance?
It can. IS 17900 has governed lifts in Delhi since 22 December 2025, and an inspection assesses the installation as it actually stands — including a corroded pit, a rescue device that does not rescue, or emergency lighting that lasts four minutes. Monsoon damage is not a separate category from compliance. It is one of the ways a compliant lift stops being one.
Maintenance records matter here too. An inspection reads the file before anyone touches the machine, and a fault log that shows recurring water-related failures with no corrective action is a poor document to hand across.
Book a Pre-Monsoon Lift Check
A Span engineer inspects the pit, machine room, rescue device, emergency lighting and electrical protection, and returns a written report on what the water has already reached and what should be corrected before the next heavy rain.
Call +91 98106 12213 · Landline 011-4907-1372 · WhatsApp the same number
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Frequently Asked Questions
- Is water in the lift pit normal during the monsoon?
- No. The standard requires the pit to be impervious to the infiltration of water once the fixings, buffers and grids are built in, and permits drainage devices in the pit floor. Water in a pit is a defect in the pit, the building envelope or the drainage — not a seasonal inevitability to be tolerated each year.
- Can we just pump the water out and carry on?
- Pumping addresses the symptom for a week. It does nothing about how the water entered, and it leaves behind corrosion on buffers, safety gear and low-level electrical fittings. Find the entry path, then deal with the damage the previous flooding has already caused.
- Our lift trips only on rainy days. Is that a coincidence?
- Almost never. Faults that appear with weather usually trace to moisture — condensation in the controller or machine room, or earth leakage caused by damp. Ask for dated fault records. A pattern that is obvious in a log is invisible in a phone call.
- How often should the ARD battery be replaced?
- It depends on the battery type, ambient temperature and how often it operates, so the honest answer is that it should be tested rather than assumed. The requirement is three consecutive rescues on one charge with landing accuracy within forty millimetres. If it cannot demonstrate that under a real supply cut, it needs attention regardless of its age on paper.
- Is a stalled lift during a power cut a safety failure?
- A lift stopping on power failure is expected. A lift that strands passengers between floors, with no rescue device, no working alarm and no emergency lighting, is a different matter. That combination is what the standard's rescue, lighting and alarm requirements exist to prevent.