Water Pump Runs Constantly or Cycles Rapidly
A pump that won’t shut off almost always means there’s a leak somewhere downstream keeping the pressure switch from satisfying — the pump itself is rarely the actual problem.
Plumbing guide
RV plumbing & water-system troubleshooting
Low pressure, a pump that won’t stop running, no hot water, or a sulfur smell — most RV plumbing complaints trace back to one of a handful of causes. Here’s how to narrow it down. BOOK A PLUMBING DIAGNOSIS Low Water Pres...
Active corridor: Montana · Wyoming · Idaho · Washington — case-by-case beyond.
Field notes
Low pressure, a pump that won’t stop running, no hot water, or a sulfur smell — most RV plumbing complaints trace back to one of a handful of causes. Here’s how to narrow it down. BOOK A PLUMBING DIAGNOSIS Low Water Pressure Pressure loss almost always has one of these causes, in rough order of likelihood:
No Hot Water
Check the bypass valve position before anything else — it’s the single most common cause and the easiest to miss.
Sewer Odor or Slow Drains
Sewer smell inside the RV is a venting or trap problem, not a tank problem — chasing the black tank won’t fix it.
Winterizing Basics
If you’re in a climate where temps drop below freezing, winterizing is not optional. Either blow out the lines with compressed air or use RV antifreeze — never automotive antifreeze. Verify the water heater bypass is ...
When to Stop and Call a Professional
Leaks inside walls or under flooring, a pump that won’t hold prime after basic checks, or any sign of water damage on ceilings or floors are worth a proper diagnosis before they get worse. A full system pressure test ...
Related
Plumbing Systems & Repair Back to Field Guide Pricing
Related: All guides · Book a Service · Pricing
Pricing teaser
Trip fee $75 within 30 miles, then $1.50/mi. Labor ~$150/hr (1-hour minimum, billed in 30-minute increments). Diagnostic $150 applied toward repair if you proceed.
Active corridor: Montana · Wyoming · Idaho · Washington — case-by-case beyond. Credentials (text): Victron Professional Certified Installer · weBoost Authorized Installer · Peplink Certified Associate · Dometic Professional Certified.