Hayward repair

Hayward heater not heating? We fix that.

Name: Hayward pool heater repair
Brand: Hayward

Cold pool, an IF on the display, or a heater that lights and quits? We fix Hayward H-Series and Universal H-Series gas heaters across Brevard County.

Call with the model number and the code. You reach a Brevard heater shop, not a national hotline.

Call (321) 536-9122 Schedule Service

98 Google reviews, rated 5.0

Which Hayward is on the pad?

Check the data plate: H-Series heaters burn gas; a HeatPro is an electric heat pump with its own codes.

Gas · H-Series

The original gas family.
Gas · Universal H-Series

H150FD · H200FD · H250FD · H300FD · H350FD · H400FD
Electric · HeatPro

HP21105T · HP21205T · HP21405T · HP31105T · HP31205T · HP31405T

The current MCHX family.

Got the model number? Call (321) 536-9122 or schedule service. Schedule Service or call (321) 536-9122.

What does my Hayward heater's code mean?

The code names the check your heater stopped on: ignition, a pressure switch or the blower. Our testing names the failed part.

Where it stopped

Blower

The control checks the blower vacuum switch, open before the blower starts and closed once it runs.

AO AC
Pre-purge

The blower clears the cabinet before any gas flows.
Ignitor

The ignitor heats up, then a 4-second trial for ignition begins.

IO FC4
Gas valve

The valve opens only after the earlier checks pass.

IF
Flame

The control watches for flame.

HF
Post-purge

The blower keeps running for 30 seconds after the burner stops. That is normal.

Sequence per Hayward's published sequence of operation.

Stopped at the blower

AO

The blower vacuum switch is open.

You check

Photograph the display. Leave the cabinet closed.

Call

Call with the code. (Call with the code)

Hayward's checks

Switch wires and vacuum tubing, the voltage selector plug, blower resistance. Hayward's answer
AC

The blower vacuum switch is closed when it should be open.

You check

Photograph the display. Leave the cabinet closed.

Call

Call with the code. (Call with the code)

Hayward's checks

Switch continuity. A blower that runs with the heater off points to the control board. Hayward's answer

Stopped at the ignitor

IO

The ignitor circuit is open.

You check

Record the code and the model.

Call

Call with the code. (Call with the code)

Hayward's checks

Ignitor wiring and ignitor resistance. Hayward's answer
FC4

An open FC4 fuse, pointing at the ignitor and blower.

You check

Note the build date on the plate if you can read it.

Call

Call with the code. (Call with the code)

Hayward's checks

Ignitor and blower wiring and resistance. Units built before September 2010 follow a different blower check. Hayward's answer

Stopped at the gas valve or flame

IF

Ignition failure.

You check

Confirm gas service to the house is on. Do not open the cabinet or adjust gas parts.

Call

Call with the code. (Call with the code)

Hayward's checks

Gas supply on, and the heater's internal gas valve set to ON. Then the flame-sensor and gas-valve connections, inlet and manifold gas pressure, and the gas valve or control board. Hayward's answer
HF

Heat or flame is sensed when the gas valve should be off.

You check

Turn the heater off.

Call

Call, and leave it off until then. (Leave it off and call)

Hayward's checks

24 VAC at the gas valve against manifold pressure, then the gas valve or control board. Hayward's answer

Water and temperature

LO

A pressure-switch problem.

You check

The pump runs, the filter is clean and the valves sit in their normal positions.

Call

Call if the code stays. (Check first, then call if it stays)

Hayward's checks

Water flow first, then the water pressure switch wiring and continuity, the high limits and the vent pressure switch. Hayward's answer
HS

High water temperature.

You check

The pump runs and the valves are open.

Call

Call if it returns. (Check first, then call if it stays)

Hayward's checks

Water inlet and outlet conditions. Hayward's answer
SF

Sensor failure.

You check

Record the code.

Call

Call with the code. (Call with the code)

Hayward's checks

Thermistor resistance. Hayward's answer

Full code list: power, board and display

Power, board and display

Blank display

Not powering up.

You check

The heater's breaker is on. Leave the cabinet closed.

Call

Call if it stays blank. (Check first, then call if it stays)

Source power, the voltage selector plug, fuses FC1 and FC2, then transformer output. Hayward's answer
PF

Hayward's first check is the incoming supply voltage.

You check

Record the code.

Call

Call with the code. (Call with the code)

Incoming power within 10% of the required voltage first, then the ground and neutral connections, then the control board. Hayward's answer
BD

A bad board or a secondary high-voltage fault.

You check

If the fault returns, leave the power off.

Call

Call with the code. (Leave it off and call)

The FC4 fuse, then voltage at the fuse board and control board. Hayward's answer
EE

A defective control board.

You check

Record the code.

Call

Call with the code. (Call with the code)

Board replacement. Hayward's answer
CE

May clear with a power reset.

You check

One power reset is Hayward's own first step.

Call

Call if it returns. (Check first, then call if it stays)

The display ribbon cable, then the display interface. Hayward's answer
SB

A stuck button.

You check

Record the code.

Call

Call with the code. (Call with the code)

The display. Hayward's answer
bo

Bypass mode.

You check

Nothing to fix. It is not a fault.

Call

No call needed. (Not a fault)

Hayward's answer

Code on the display? Call (321) 536-9122 and read it to us with the model number.

or text (321) 536-9122 Include photos of the fault on the display and the rating plate.

Resetting past BD, FC4 or HF trades a fault we can diagnose for a bigger one.

Why won't my Hayward pool heater turn on?

Check three things first:

The filter pump runs.
The set point sits above the water temperature.
The breaker is on.

Still blank? Then it's a power fault: source power, voltage selector plug, fuses FC1 and FC2, transformer. That's our work.
On a Hayward Omni system, "Heating" with no heat most often means the heater isn't in bypass mode (bo). If the automation itself has failed, that's our work too.

Why does my Hayward light, then shut off?

It stopped on one of its own checks, and the display names which: IF, LO or HS.

About 30 seconds of blower after the flame goes out is normal post-purge.
IF again and again means we test the gas supply, flame sensor and gas pressures.
Smell gas after it cuts out? Leave the heater off, move away, and follow the gas-smell steps.

Can I order the Hayward part the code names?

Not from the code alone. Each code points to several parts, and we test to find the one that failed.

IF The gas valve or the control board, after gas supply, flame sensor and pressure are ruled out.
AO The blower vacuum switch, its tubing, or the blower.
LO The water pressure switch, a high limit or the vent pressure switch.
IOFC4 The ignitor or the blower.

Where can I find my Hayward pool heater manual?

Enter the full model number from the data plate in Hayward's Product Resource Search.

Send the Hayward details

Put the model number and the display code in the details field, and we'll call back ready to diagnose.

What is my HeatPro's display telling me?

A HeatPro code names a flow, pressure or defrost state. The label depends on the unit's generation.

Current MCHX: FLOLPHP
Older HeatPro: PSHI

What do `FLO`, `LP` and `HP` mean on a current HeatPro MCHX?

FLO is water-flow trouble. LP is low pressure — airflow, low refrigerant or low ambient conditions. HP is high pressure, usually flow or load. MCHX troubleshooting guide.

Is `dEF` on a Hayward HeatPro a failure?

Not necessarily. dEF is defrost mode, and no action is needed during the cycle. If heat doesn't return afterwards, call us.

Why is there water under my Hayward HeatPro?

Condensation, most of the time. Hayward counts three to five gallons an hour as normal in humid conditions. Condensation dries after the unit stops; a true leak keeps running.

HeatPro still not heating? Call (321) 536-9122 or schedule service. Schedule Service or call (321) 536-9122.

Repair or replace the Hayward?

The failure type decides more than the age. A failed sensor or ignitor is a part swap; a leaking heat exchanger changes the conversation.

Usually a component repair

Sensor, switch or high limit
Ignitor or flame sensor
A fault in the low-voltage wiring
Blower motor
The ignition-control board itself

Changes the conversation

Leaking heat exchanger
A second exchanger failure on the same unit
Failed compressor on a HeatPro

Weighing a new heater? See repair or replace and what repair costs.

Two technicians working on an open gas pool heater on a paver equipment pad, with a lake and fountain behind them

Can a tune-up keep a Hayward out of this?

Partly. Sooting from a poor fuel-air mix damages exchangers; our gas tune-up checks for a safe, efficient burn.

Balanced water and a clean filter protect the exchanger between tune-ups.

Put both yearly tune-ups on the Maintenance Club.

$27.50 a month or $275 a year (two months free), with priority service and 20% off repair labor. See the Maintenance Club →

Another brand on the pad? Pentair Sta-Rite Lochinvar Rheem Raypak Jandy

Bring the model and the code.

Tell us whatever you see or hear at the pad.